Duchy of Brittany

former European sovereign state 939–1547, then dukedom of the Kingdom of France

58 dated entries naming Duchy of Brittany, drawn from 53 separate years between 818 CE and 1598 CE. Nothing here is written by us: each line is the sentence a Wikipedia year article used, and the link beside it opens the exact revision.

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9th century

818Morman, chieftain and king of Brittanysource
831Nominoe, duke of Brittany, is designated missus imperatoris (imperial emissary) by Louis the Pious, at Ingelheim (modern Germany).source
845November 22 – Battle of Ballon: Frankish forces (3,000 men) led by Charles the Bald are defeated by Nominoe, count of Vannes, near Redon, Ille-et-Vilaine. After the battle, Brittany becomes a regnum 'kingdom' within the Frankish Empire.source
851August 22 – Battle of Jengland: Duke Erispoe takes command of the Breton forces after his father Nominoe, king of Brittany, dies. He continues an offensive against the Franks in alliance with Lambert II of Nantes. In Ille-et-Vilaine near Grand-Fougeray (Brittany), Erispoe defeats a Frankish-Saxon army (4,000 men) led by King Charles the Bald.source
851March 7 – Nominoe, king (or duke) of Brittanysource
856King Charles the Bald cedes the county of Maine to Erispoe, ruler (duke) of Brittany—this in return for an alliance against the Vikings.source
861March – Robert the Strong is appointed margrave of Neustria by King Charles the Bald. He re-establishes the Breton March, and extends his remit by campaigning against Salomon, duke 'king' of Brittany. Robert hires a combined Seine-Loire fleet for 6,000 pounds of silver, 'before Salomon can ally with them against him'. In return, Salomon enlists 12 Viking ships under the command of Hastein, to raid the county of Maine, which, with Anjou, becomes squeezed between Brittany and Neustria.source
867August – Treaty of Compiègne: King Charles the Bald cedes the Cotentin Peninsula to Salomon, duke ('king') of Brittany, after he had sent his son-in-law Pascweten to negotiate a peace. Charles orders the fortification of the cities of Tours, Le Mans and Compiègne.source
868Salomon, duke ('king') of Brittany, leads a joint campaign against the Loire Vikings. He is forced to defend southeastern Brittany unaided, and mobilizes levies raised at Poitiers to defeat the Vikings.source
874Salomon, duke ('king') of Brittany, is murdered by a faction which includes his son-in-law Pascweten and Gurvand, son-in-law of late ruler Erispoe. After Salomon's death they divide the country, and Pascweten and Gurvand co-rule Brittany.source
874Salomon, duke ('king') of Brittanysource
876Gurvand, duke ('king') of Brittanysource
888Judicael, duke of Brittany (or 889)source
888October – Alan I (the Great), count of Vannes, and his rival Judicael, unite their forces to defeat the Vikings at Questembert (or 889). Judicael is killed, in a notable victory for the Bretons, with 15,000 Vikings crushed, some few 400 escaping to their ships. In command of a 'united' Breton force, Alan is able to drive the Vikings back to the Loire River. Alan becomes sole ruler of Brittany, and over the Frankish counties of Rennes, Nantes, Coutances and Avranches.source
889Judicael, duke of Brittany (or 888)source

10th century

952Alan II (Wrybeard), duke of Brittanysource
992June 27 – Battle of Conquereuil: The Angevins under Fulk III "the Black", Count of Anjou, defeat the forces of Conan I, duke of Brittany, who is killed in the battle at Conquereuil (France).source
992June 27 – Conan I, duke of Brittanysource
997Alan III (de Bretagne), duke of Brittany (d. 1040)source
999Odo, Count of Penthièvre, duke and regent of Brittany (approximate date) (d. 1079)source

11th century

1008November 20 – Geoffrey I, duke of Brittany (b. 980)source
1031Hoël II (or Houel), duke of Brittany (approximate date)source
1033Conan II, duke of Brittany (approximate date)source
1037Hawise, duchess of Brittany (approximate date)source
1040October 1 – Alan III, duke of Brittany (b. 997)source
1066December 11 – Conan II, duke of Brittanysource
1068Ermengarde of Anjou, duchess of Aquitaine and Brittany (d. 1146)source
1072August 19 – Hawise, duchess of Brittanysource
1079Odo of Rennes, duke and regent of Brittany (b. 999)source
1080Bertha of Blois, duchess of Brittany (approximate date)source
1084Hoël II, duke of Brittany (House of Cornouaille)source
1090August 13 – Constance of Normandy, duchess of Brittanysource

12th century

1119October 13 – Alan IV, duke of Brittany (b. 1063)source
1138Conan IV (the Young), duke of Brittany (d. 1171)source
1148September 17 – Conan III, duke of Brittany (b. 1095)source
1158September 23 – Geoffrey II, duke of Brittany (d. 1186)source
1161Constance, duchess of Brittany (approximate date)source
1171February 20 – Conan IV ("the Young"), duke of Brittany (b. 1138)source
1187March 29 – Arthur I (or Arzhur), duke of Brittany (d. 1203)source
1199Summer – Philip II renews his war against England, supporting the rival claim to the English throne of John's 12-year-old nephew Arthur I, duke of Brittany.source
1200May 22 – The Kings John of England and Philip II of France, sign a peace treaty at Le Goulet, an island in the middle of the Seine River, near Vernon in Normandy. The agreement recognizes John as overlord of most of the English owned lands in France, but John has to give Philip the lands of Norman Vexin and Évreux and a large sum of money (some 20,000 marks) – a "relief" payment for recognition of John's sovereignty of Brittany.source

13th century

1201March 25 – Constance, duchess of Brittany, founds Villeneuve Abbey and gives it a charter.source
1201September 5 – Constance, duchess of Brittany (b. 1161)source
1226Blanche of Navarre (or Champagne), duchess of Brittany (d. 1283)source
1230April 30 – English invasion of France: King Henry III embarks from Portsmouth with a large expeditionary force. On May 2, he arrives on the island of Guernsey, and the next day the English army lands at Saint-Malo, where Peter I (de Dreux), duke of Brittany, meets Henry to pay him homage. The English forces march through the County of Anjou, taking the castle of Mirebeau in late July.source

14th century

1341The Breton War of Succession begins, over the control of the Duchy of Brittany.source
1351March 26 – War of the Breton Succession: Combat of the Thirty – Thirty chosen knights each, from the Kingdoms of France and England, fight to determine who will rule the Duchy of Brittany; a Franco-Breton victory is assured by the squire Guillaume de Montauban.source
1372February 21 – Jean, County of Montfort, Duke of Brittany makes a secret agreement with the Kingdom of England to allow English troops to pass through the lands he owns during the English war with France, event though he had previously allied with King Charles V of France in the same war.source
1373February 16 – King Edward III of England appoints Lord Salisbury to command a fleet of English and Genoese galleys and 1,700 soldiers to fight in the Duchy of Brittany.source
1392July 1 – King Charles VI of France, outraged at an attempt to assassinate his advisor Olivier V de Clisson, leads an invasion against the Duchy of Brittany and Duke Jean V for harboring the perpetrator, Pierre de Craon.source
1399November 1 – At Nantes, Jean V of the House of Montfort begins his reign of 43 years as the Duke of Brittany (Bretagne), an independent duchy that is now part of France, upon the death of his father, Jean IV.source

15th century

1459February 3 – The coronation of François II as Duke of the semi-independent Duchy of Brittany takes place in Nantes.source
1480January 3 – King Louis XI buys the succession rights to the Duchy of Brittany from the Countess Nicole de Châtillon for 50,000 livressource
1487June 19 – French–Breton War: The siege of the city of Nantes in the Duchy of Brittany is started by King Charles VIII of France, but fails after less than two months and is lifted on August 6.source
1491December 6 – King Charles VIII of France marries the Duchess Anne of Brittany, forcing her to break her marriage contract with Maximilian I, Holy Roman Emperor, and incorporating the Duchy of Brittany into the kingdom of France.source

16th century

1532August 13 – Union of Brittany and France: The Duchy of Brittany is absorbed into the Kingdom of France.source
1547August 13 – The Duchy of Brittany unites with the Kingdom of France.source
1598March 20 – The Duchy of Brittany in France is conquered by King Henry IV, who forces the surrender of Philippe Louis de Lorraine-Mercœur, Duke of Brittany. Merceur is then exiled to Hungary.source