{"slug": "kievan-rus", "label": "Kievan Rus'", "wikipedia": "https://en.wikipedia.org/wiki/Kievan_Rus%27", "wikidata": "https://www.wikidata.org/wiki/Q1108445", "qid": "Q1108445", "description": "former federation of East Slavic tribes", "entries": 55, "years": 49, "span": [800, 1251], "span_label": ["800 CE", "1251 CE"], "topics": [{"title": "Conflict & Security", "count": 20}, {"title": "Deaths", "count": 13}, {"title": "Births", "count": 7}, {"title": "Geopolitics & Diplomacy", "count": 6}, {"title": "Religion & Belief", "count": 5}, {"title": "Exploration & Expansion", "count": 3}, {"title": "Culture & Society", "count": 1}], "related": [{"slug": "vladimir-the-great", "label": "Vladimir the Great", "shared": 7}, {"slug": "sviatoslav-i", "label": "Sviatoslav I", "shared": 5}, {"slug": "byzantine-empire", "label": "Byzantine Empire", "shared": 4}, {"slug": "kiev", "label": "Kiev", "shared": 4}, {"slug": "ukraine", "label": "Ukraine", "shared": 3}, {"slug": "varangians", "label": "Varangians", "shared": 3}, {"slug": "batu-khan", "label": "Batu Khan", "shared": 3}, {"slug": "cumans", "label": "Cumans", "shared": 3}, {"slug": "constantinople", "label": "Constantinople", "shared": 2}, {"slug": "balkans", "label": "Balkans", "shared": 2}, {"slug": "thrace-theme", "label": "Thrace (theme)", "shared": 2}, {"slug": "holy-roman-empire", "label": "Holy Roman Empire", "shared": 2}], "items": [{"year": 800, "year_label": "800 CE", "section": "Geopolitics & Diplomacy", "date": null, "text": "The Rus' Khaganate is created by people who are called Rus', after the 182-year dominance of the Khazars. This is the starting period of the rise of the Kievan Rus', and the later states of Russia, Belarus and Ukraine (approximate date).", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1367075277#Europe", "title": "800", "revid": 1367075277, "section": "Events › Europe"}}, {"year": 882, "year_label": "882 CE", "section": "Conflict & Security", "date": null, "text": "Oleg of Novgorod takes Kiev, and makes it his capital, forming the Kievan Rus'.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1345951089#Europe", "title": "882", "revid": 1345951089, "section": "Events › By place › Europe"}}, {"year": 890, "year_label": "890 CE", "section": "Births", "date": null, "text": "Olga of Kiev, princess and regent of Russia (approximate date)", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1373061013#Births", "title": "890", "revid": 1373061013, "section": "Births"}}, {"year": 907, "year_label": "907 CE", "section": "Conflict & Security", "date": null, "text": "Rus'–Byzantine War: Varangian prince Oleg of Novgorod leads the Kievan Rus' in a campaign against Constantinople, concluded by the Rus'–Byzantine Treaty (in which the city of Chernihiv in Ukraine is first mentioned). He lays siege to the Byzantine capital with some 2,000 ships (dugout boats), and secures trading rights from the world's leading center of commerce.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1341130849#Byzantine_Empire", "title": "907", "revid": 1341130849, "section": "Events › By place › Byzantine Empire"}}, {"year": 943, "year_label": "943 CE", "section": "Conflict & Security", "date": null, "text": "Spring – Allied with the Rus', a Hungarian army raids Moesia and Thrace. Emperor Romanos I buys peace, and accepts to pay a yearly tribute (protection money) to the Hungarians. His frontiers now 'protected' on the Balkan Peninsula, Romanos sends a Byzantine expeditionary force (80,000 men) led by general John Kourkouas (his commander-in-chief) to invade northern Mesopotamia (modern Iraq).", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1364916983#Byzantine_Empire", "title": "943", "revid": 1364916983, "section": "Events › By place › Byzantine Empire"}}, {"year": 945, "year_label": "945 CE", "section": "Conflict & Security", "date": null, "text": "Igor I, ruler of the Kievan Rus', is killed while collecting tribute from the Drevlians and is succeeded by his three-year-old son Sviatoslav I. His mother Olga becomes regent and the official ruler.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365595392#Europe", "title": "945", "revid": 1365595392, "section": "Events › By place › Europe"}}, {"year": 945, "year_label": "945 CE", "section": "Deaths", "date": null, "text": "Igor I, Varangian ruler of Kievan Rus'", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365595392#Deaths", "title": "945", "revid": 1365595392, "section": "Deaths"}}, {"year": 957, "year_label": "957 CE", "section": "Religion & Belief", "date": null, "text": "Olga of Kiev, ruler and regent of Kievan Rus', converts to the Eastern Orthodox Church, from paganism (approximate date).", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1341512729#Religion", "title": "957", "revid": 1341512729, "section": "Events › By topic › Religion"}}, {"year": 958, "year_label": "958 CE", "section": "Births", "date": null, "text": "Vladimir I (the Great), Grand Prince of Kiev (d. 1015)", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1364468198#Births", "title": "958", "revid": 1364468198, "section": "Births"}}, {"year": 962, "year_label": "962 CE", "section": "Births", "date": null, "text": "Rogneda of Polotsk, Grand Princess of Kiev (d. 1002)", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1341513175#Births", "title": "962", "revid": 1341513175, "section": "Births"}}, {"year": 963, "year_label": "963 CE", "section": "Births", "date": "March 13", "text": "March 13 – Anna Porphyrogenita, Grand Princess of Kiev (d. 1011)", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365272224#Births", "title": "963", "revid": 1365272224, "section": "Births"}}, {"year": 965, "year_label": "965 CE", "section": "Conflict & Security", "date": null, "text": "The Khazar fortress city of Sarkel, located on the Lower Don River, is captured by Kievan Rus' under Grand Prince Sviatoslav I. The city is renamed Belaya Vezha (White Fortress) and settled by Slavs.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1371364470#Europe", "title": "965", "revid": 1371364470, "section": "Events › By place › Europe"}}, {"year": 967, "year_label": "967 CE", "section": "Conflict & Security", "date": null, "text": "Summer – Sviatoslav I, Grand Prince of Kiev, defeats Bulgar forces in the Balkans at the behest of Emperor Nikephoros II (who pays him 1,500 pounds of gold to invade the Bulgarian Empire).", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1364919490#Europe", "title": "967", "revid": 1364919490, "section": "Events › By place › Europe"}}, {"year": 968, "year_label": "968 CE", "section": "Conflict & Security", "date": null, "text": "Emperor Nikephoros II receives a Bulgarian embassy led by Prince Boris (the son of Tsar Peter I of Bulgaria), with a plea for help against the invading Kievan Rus'. Nikephoros, occupied in the East, is unable to support him. Instead he sends envoys to summon the Pechenegs to aid Boris. They besiege Kiev, but Grand Prince Sviatoslav I (on campaign in Bulgaria) returns with a Kievan relief force, and defeats the Pechenegs. He drives them out into the Steppe, and sets up viceroys to rule his Rus' territory.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1364919231#Byzantine_Empire", "title": "968", "revid": 1364919231, "section": "Events › By place › Byzantine Empire"}}, {"year": 969, "year_label": "969 CE", "section": "Geopolitics & Diplomacy", "date": null, "text": "Peter I, emperor (tsar) of the Bulgarian Empire, suffers a stroke and abdicates the throne in favour of his eldest son Boris II. He arrives (after being an honorary hostage at Constantinople) in Preslav and is proclaimed as the new ruler. Boris regains lost territory from the Kievan Rus' and recaptures Pereyaslavets, an important trade city at the mouth of the Danube.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365590679#Europe", "title": "969", "revid": 1365590679, "section": "Events › By place › Europe"}}, {"year": 969, "year_label": "969 CE", "section": "Deaths", "date": "July 11", "text": "July 11 – Olga of Kiev, princess and regent of Russia (b. c. 890)", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365590679#Deaths", "title": "969", "revid": 1365590679, "section": "Deaths"}}, {"year": 970, "year_label": "970 CE", "section": "Conflict & Security", "date": null, "text": "Battle of Arcadiopolis: John I dispatches an elite force (10–12,000 men) to delay the Kievan Rus'. The Byzantines under Bardas Skleros successfully ambush the Kievan-Bulgarian invaders at Arcadiopolis (modern Turkey). The battle turns into a complete rout, killing thousands. Grand Prince Sviatoslav I is driven out of Thrace and withdraws his forces to the fortress city of Silistra.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365261460#Byzantine_Empire", "title": "970", "revid": 1365261460, "section": "Events › By place › Byzantine Empire"}}, {"year": 972, "year_label": "972 CE", "section": "Conflict & Security", "date": null, "text": "Spring – Emperor John I Tzimiskes divides the Bulgarian territories, recently held by the Kievan Rus', into six new themes. He turns his attention to the East against the Abbasid Caliphate and its vassals, beginning with an invasion of Upper Mesopotamia. John transfers Byzantine troops to Macedonia, and the region of Philippopolis in Thrace, to dilute the Slavs.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365272305#Byzantine_Empire", "title": "972", "revid": 1365272305, "section": "Events › By place › Byzantine Empire"}}, {"year": 980, "year_label": "980 CE", "section": "Births", "date": null, "text": "Sviatopolk I, Grand Prince of Kiev (approximate date)", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1364109392#Births", "title": "980", "revid": 1364109392, "section": "Births"}}, {"year": 980, "year_label": "980 CE", "section": "Geopolitics & Diplomacy", "date": "June 11", "text": "June 11 – Vladimir I (the Great), grand prince of Kiev, consolidates the Kievan realm from modern Ukraine to the Baltic Sea. Vladimir is proclaimed ruler (knyaz) of all Kievan Rus'.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1364109392#Europe", "title": "980", "revid": 1364109392, "section": "Events › By place › Europe"}}, {"year": 987, "year_label": "987 CE", "section": "Conflict & Security", "date": "February 7", "text": "February 7 – Bardas Phokas (the Younger) and Bardas Skleros, two members of the military elite, begin a wide-scale rebellion against Emperor Basil II. They overrun Anatolia, and Phokas declares himself Emperor. Basil applies for military assistance from Prince Vladimir the Great, ruler of Kievan Rus', who agrees to help him and sends a Varangian army (6,000 men).", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1364468366#Byzantine_Empire", "title": "987", "revid": 1364468366, "section": "Events › By place › Byzantine Empire"}}, {"year": 988, "year_label": "988 CE", "section": "Culture & Society", "date": null, "text": "Grand Prince Vladimir the Great, ruler of Kievan Rus', marries Anna Porphyrogenita (sister of Basil II) and converts to Christianity. He is baptized at Cherson in the Crimea, taking the Christian name of Basil (in honor of his brother-in-law). Vladimir returns in triumph to Kiev, and begins the Christianization of Kievan Rus' to the Eastern Orthodox Church.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1364920019#Religion", "title": "988", "revid": 1364920019, "section": "Events › By topic › Religion"}}, {"year": 1001, "year_label": "1001 CE", "section": "Births", "date": null, "text": "Ingegerd Olofsdotter, Grand Princess of Kiev (d. 1050)", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1341910152#Births", "title": "1001", "revid": 1341910152, "section": "Births"}}, {"year": 1002, "year_label": "1002 CE", "section": "Deaths", "date": null, "text": "Rogneda of Polotsk, Grand Princess of Kiev (b. 962)", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1371270947#Deaths", "title": "1002", "revid": 1371270947, "section": "Deaths"}}, {"year": 1011, "year_label": "1011 CE", "section": "Religion & Belief", "date": null, "text": "The Grand Prince of Kyiv and ruler of Kievan Rus' Vladimir the Great laid the first foundations of Saint Sophia Cathedral, Kyiv.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1368048875#Europe", "title": "1011", "revid": 1368048875, "section": "Events › By place › Europe"}}, {"year": 1011, "year_label": "1011 CE", "section": "Deaths", "date": null, "text": "Anna Porphyrogenita, Grand Princess of Kiev", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1368048875#Deaths", "title": "1011", "revid": 1368048875, "section": "Deaths"}}, {"year": 1015, "year_label": "1015 CE", "section": "Deaths", "date": "July 15", "text": "July 15 – Vladimir the Great, Grand Prince of Kiev", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365259982#Deaths", "title": "1015", "revid": 1365259982, "section": "Deaths"}}, {"year": 1015, "year_label": "1015 CE", "section": "Deaths", "date": "July 15", "text": "July 15 – Vladimir the Great dies at Berestove after a 35-year reign. He is succeeded by his son Sviatopolk I as Grand Prince of Kiev.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365259982#Europe", "title": "1015", "revid": 1365259982, "section": "Events › By place › Europe"}}, {"year": 1016, "year_label": "1016 CE", "section": "Conflict & Security", "date": null, "text": "Georgius Tzul, ruler of Khazaria, is captured by a combined Byzantine Empire–Kievan Rus' force, which effectively ends Khazaria's existence.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365261531#Europe", "title": "1016", "revid": 1365261531, "section": "Events › By place › Europe"}}, {"year": 1018, "year_label": "1018 CE", "section": "Geopolitics & Diplomacy", "date": "January 30", "text": "January 30 – The Peace of Bautzen: Emperor Henry II signs a peace treaty with Bolesław I the Brave, Duke of Poland, ending the German–Polish War. Poland keeps Lusatia – the Holy Roman Empire keeps Bohemia. With this peace agreement, Bolesław redirects his forces on an offensive against the Kievan Rus'.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1367470608#Europe", "title": "1018", "revid": 1367470608, "section": "Events › By place › Europe"}}, {"year": 1019, "year_label": "1019 CE", "section": "Deaths", "date": null, "text": "Sviatopolk I, Grand Prince of Kiev (b. 980)", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1342212971#Deaths", "title": "1019", "revid": 1342212971, "section": "Deaths"}}, {"year": 1019, "year_label": "1019 CE", "section": "Deaths", "date": null, "text": "Sviatopolk I dies, and is succeeded by his brother Yaroslav I (the Wise). He becomes the Grand Prince of Kiev with the support of the Novgorodians and the help of Varangian (Viking) mercenaries. Yaroslav consolidates the Kievan state, through both cultural and administrative improvements, and military campaigns.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1342212971#Europe", "title": "1019", "revid": 1342212971, "section": "Events › By place › Europe"}}, {"year": 1024, "year_label": "1024 CE", "section": "Conflict & Security", "date": null, "text": "Battle of Lemnos: Kievan Viking raiders (800 men) sail through the straits at Abydos to the Aegean Sea. From there they make for the island of Lemnos, but are defeated by a Byzantine fleet of the Cibyrrhaeot Theme.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1342213215#Europe", "title": "1024", "revid": 1342213215, "section": "Events › By place › Europe"}}, {"year": 1043, "year_label": "1043 CE", "section": "Conflict & Security", "date": null, "text": "Rus'–Byzantine War: A Kievan Rus' naval raid, led by Grand Prince Vladimir Yaraslavich, unsuccessfully attacks Constantinople. A 6,000-strong Kievan contingent under Vyshata is also defeated and deported to the capital.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365591040#Byzantine_Empire", "title": "1043", "revid": 1365591040, "section": "Events › By place › Byzantine Empire"}}, {"year": 1047, "year_label": "1047 CE", "section": "Exploration & Expansion", "date": null, "text": "Winter – Constantine IX allows the Pecheneg tribes to cross the Danube and settle permanently in Byzantine territory. He buys their alliance with presents, using them to attack his enemies (Bulgars and Magyars) in the rear, and so to prevent any southward advance of the Kievan Rus'.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1368550348#Byzantine_Empire", "title": "1047", "revid": 1368550348, "section": "Events › By place › Byzantine Empire"}}, {"year": 1053, "year_label": "1053 CE", "section": "Births", "date": "May 26", "text": "May 26 – Vladimir II, Grand Prince of Kiev (d. 1125)", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1350130055#Births", "title": "1053", "revid": 1350130055, "section": "Births"}}, {"year": 1054, "year_label": "1054 CE", "section": "Deaths", "date": "February 20", "text": "February 20 – Yaroslav the Wise, Kievan Rus' grand prince (b. c.978)", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1267065294#Deaths", "title": "1054", "revid": 1267065294, "section": "Deaths"}}, {"year": 1061, "year_label": "1061 CE", "section": "Conflict & Security", "date": null, "text": "Sosols (a tribe in Estonia) destroy the Kievan Rus' fortification of Yuryev in Tartu, and carry out a raid on Pskov.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1371210530#Europe", "title": "1061", "revid": 1371210530, "section": "Events › By place › Europe"}}, {"year": 1068, "year_label": "1068 CE", "section": "Conflict & Security", "date": null, "text": "Battle of the Alta River: The Cumans defeat the Kievan Rus' forces of Grand Prince Iziaslav I, and his brothers Sviatoslav II and Vsevolod I.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1372127712#Europe", "title": "1068", "revid": 1372127712, "section": "Events › By place › Europe"}}, {"year": 1078, "year_label": "1078 CE", "section": "Deaths", "date": "October 3", "text": "October 3 – Grand Prince Iziaslav I dies, and is succeeded by Vsevolod I, who unites the principalities – Kiev, Chernigov and Pereyaslavl – in Kievan Rus'.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1329585949#Europe", "title": "1078", "revid": 1329585949, "section": "Events › By place › Europe"}}, {"year": 1093, "year_label": "1093 CE", "section": "Deaths", "date": "April 13", "text": "April 13 –The Grand Prince of Kiev Vsevolod I Yaroslavich dies, after a 15-year reign. He is succeeded by Sviatopolk II, who is acknowledged by other princes as the senior son of Iziaslav I, and ascends the Kievan throne as ruler of the Kievan Rus'. His cousin Vladimir II, prince of Chernigov, becomes a bitter rival.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1291997155#Europe", "title": "1093", "revid": 1291997155, "section": "Events › By place › Europe"}}, {"year": 1100, "year_label": "1100 CE", "section": "Religion & Belief", "date": "August 30", "text": "August 30 – After the failure of the Council of Liubech in 1097, the Congress of Vytechev establishes peace and the feudal system in Kievan Rus; the princes come to an agreement to share the country between them. Sviatopolk II of Kiev becomes the first Grand Prince.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365265768#Europe", "title": "1100", "revid": 1365265768, "section": "Events › By place › Europe"}}, {"year": 1107, "year_label": "1107 CE", "section": "Exploration & Expansion", "date": null, "text": "Winter – Bolesław III undertakes a punitive expedition against his half-brother Zbigniew with the help of Kievan and Hungarian allies.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365266728#Europe", "title": "1107", "revid": 1365266728, "section": "Events › By place › Europe"}}, {"year": 1111, "year_label": "1111 CE", "section": "Conflict & Security", "date": "March 27", "text": "March 27 – Battle of the Salnitsa river: Prince Vladimir of Kievan Rus' inflicts a crushing defeat on the Cumans (Polovtsy).", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365268639#Europe", "title": "1111", "revid": 1365268639, "section": "Events › By place › Europe"}}, {"year": 1113, "year_label": "1113 CE", "section": "Deaths", "date": "April 16", "text": "April 16 – Sviatopolk II, Grand Prince of Kiev, dies after a 20-year reign and is succeeded by his 60-year-old cousin Vladimir II Monomakh. He begins a campaign against the Cumans on the steppe in an effort to reunite the land of Kievan Rus'.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1267067505#Europe", "title": "1113", "revid": 1267067505, "section": "Events › By place › Europe"}}, {"year": 1125, "year_label": "1125 CE", "section": "Deaths", "date": "May 19", "text": "May 19 – Vladimir II, Grand Prince of Kiev (b. 1053)", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365270881#Deaths", "title": "1125", "revid": 1365270881, "section": "Deaths"}}, {"year": 1136, "year_label": "1136 CE", "section": "Geopolitics & Diplomacy", "date": "May 28", "text": "May 28 – In Russia, the people of Novgorod depose and imprison Prince Vsevolod of Pskov. Novgorod asserts its independence from Kiev, but accepts protection from neighboring Kievan princes. In July, Vsevolod along with his wife and family are released (they are exiled to an uncle in Kiev).", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1365584360#Europe", "title": "1136", "revid": 1365584360, "section": "Events › By place › Europe"}}, {"year": 1142, "year_label": "1142 CE", "section": "Conflict & Security", "date": null, "text": "Duke Władysław II the Exile attempts to subject his younger (half)-brothers to re-unite Poland. He is supported by the alliances with the Kievan Rus' and the Holy Roman Empire.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1362174122#Europe", "title": "1142", "revid": 1362174122, "section": "Events › By place › Europe"}}, {"year": 1169, "year_label": "1169 CE", "section": "Conflict & Security", "date": null, "text": "Andrey Bogolyubsky, Grand Prince of Vladimir-Suzdal, sacks Kiev (with help from allies) and makes Vladimir the capital of Kievan Rus'. He installs relatives on the throne at Kiev.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1367314843#Europe", "title": "1169", "revid": 1367314843, "section": "Events › By place › Europe"}}, {"year": 1223, "year_label": "1223 CE", "section": "Religion & Belief", "date": "February", "text": "February – A council of Russian princes summons at Kiev; several princes are convinced by Köten Khan to assemble an allied army to drive the Mongols back. During the first half of March, Russian princes return to their principalities and begin to raise forces for the forthcoming campaign. The alliance has a combined force of some 60,000 men, mainly cavalry. Subutai unites his army with Jebe, and sends ambassadors to the Kievan Rus' princes, to tell them to stay out of the conflict as it didn't involve them.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1336497375#Mongol_Empire", "title": "1223", "revid": 1336497375, "section": "Events › Other events, by place › Mongol Empire"}}, {"year": 1236, "year_label": "1236 CE", "section": "Exploration & Expansion", "date": null, "text": "The Mongols under Batu Khan, eldest of Jochi, sweep across Central Asia. They settle in the Russian steppe, curtailing the power of the Kievan Rus', extracting tribute from their neighbors, and disrupting their relationship with the Byzantine Empire.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1361428601#Mongol_Empire", "title": "1236", "revid": 1361428601, "section": "Events › By place › Mongol Empire"}}, {"year": 1238, "year_label": "1238 CE", "section": "Conflict & Security", "date": "January 15", "text": "January 15–20 – Siege of Moscow: The Mongols under Batu Khan and Subutai campaign across the northern heartland of the Kievan Rus', committing numerous atrocities across multiple settlements, including the sacking of an insignificant town known as Moscow. According to the Chronicle of Novgorod, Moscow is a fortified village, a trading post \"on a crossroads of four rivers\". The village is taken by the Mongols after 5 days of siege.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1337076438#Mongol_Empire", "title": "1238", "revid": 1337076438, "section": "Events › By place › Mongol Empire"}}, {"year": 1239, "year_label": "1239 CE", "section": "Conflict & Security", "date": null, "text": "The Mongol invasion of Kievan Rus': The Mongols under Batu Khan continue their campaign across the Pontic Steppe. After devastating the Crimea and campaigning against the Circassians in the Caucasus, they turn towards the Kievan Rus'. In March, Pereyaslavl, capital of the Principality of Pereyaslavl, is sacked by the Mongols.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1368650554#Mongol_Empire", "title": "1239", "revid": 1368650554, "section": "Events › By place › Mongol Empire"}}, {"year": 1240, "year_label": "1240 CE", "section": "Religion & Belief", "date": null, "text": "Pope Gregory IX authorizes a Crusade against Novgorod, hoping that the Kievan Rus' will be too preoccupied dealing with the raiding Mongols to the east to defend.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1361428406#Religion", "title": "1240", "revid": 1361428406, "section": "Events › By topic › Religion"}}, {"year": 1251, "year_label": "1251 CE", "section": "Geopolitics & Diplomacy", "date": null, "text": "Alexander Nevsky signs the first peace treaty between Kievan Rus' and Norway.", "cite": {"url": "https://en.wikipedia.org/w/index.php?oldid=1362481176#Europe", "title": "1251", "revid": 1362481176, "section": "Events › By place › Europe"}}]}