The 530s

530 CE23 entries

• September 22 – Pope Felix IV dies at Rome after a tenure of four years, two months and 13 days, in which he has condemned semi-pelagianism. He is succeeded by Boniface II, who becomes the 55th pope.
• December 15 – Emperor Justinian I selects a second commission to excerpt and codify the writings of the jurists on Roman law. This becomes the Digest (Pandects).
• Spring – Battle of Dara: Belisarius and Hermogenes (magister officiorum) defeat a combined Persian-Arab army of 50,000 men at Dara (modern Turkey), by entrenching his infantry in a refused position in the centre line, then carrying out a cavalry envelopment to culminate a classic defensive-offensive battleplan.

531 CE25 entries

• April 19 – Battle of Callinicum: A Byzantine army (20,000 men), commanded by Belisarius, is defeated by the Persians at Raqqa (northern Syria). Emperor Justinian I negotiates an end to the hostilities, and Belisarius is hailed as a hero.
• Some members of the Blue and Green chariot racing factions in Constantinople are imprisoned for murder, precipitating the Nika riots the next year.
• The reign of Chang Guang Wang, ruler of Northern Wei, ends. Gao Huan, Chinese general, begins a rebellion and declares another member of the imperial clan, An Ding Wang, emperor.

532 CE23 entries

• January 11 – Nika riots in Constantinople: Anger among the supporters of the most important chariot teams—the Blues and the Greens—escalates into violence towards the emperor. For the next five days the capital is in chaos. The fires that start during the tumult result in the destruction of much of the city. The insurrection is put down a week later by Belisarius and Mundus; 30,000 people are killed in the Hippodrome.
• February 23 – Emperor Justinian I orders the building of a new Orthodox Christian basilica in Constantinople – the Hagia Sophia. He chooses Isidore of Miletus and Anthemius of Tralles as architects. The material for the construction is brought from all over the empire, such as large stones from quarries in Porphyry, Egypt. More than 10,000 people are employed.
• October 17 – Pope Boniface II dies in Rome after a tenure of two years, four months and six days.

533 CE17 entries

• January 2 – After an interregnum of 2 months and 15 days, Pope John II becomes the 56th pope of Rome, and the first to adopt a regnal name upon elevation to the papacy (his birth name, Mercurius, being of pagan origin).
• June 21 – A Byzantine expeditionary fleet under Belisarius sails in 500 transports, escorted by 92 war vessels (dromons), manned by 20,000 seamen from Constantinople, to attack the Vandals in Africa, via Greece and Sicily. The fleet carries 10,000 infantry, about half Byzantine and half foederati, and 5,000 cavalry, consisting of 3,000 Byzantine horsemen, 1,000 foreign allies (Huns and Heruli) and 1,500 of Belisarius' retainers (bucellarii). On the flagship Belisarius is accompanied by his military secretary Procopius, and his wife Antonina.
• September – Belisarius arrives at Sicily, which he uses as a staging area, with the permission of the Ostrogoth queen Amalasuntha, daughter of Theodoric the Great and regent of Italy. The Ostrogoths help him with supplies and the fleet is prepared for the final attack.

534 CE18 entries

• March – King Gelimer surrenders to Belisarius, after spending a winter in the mountains of Numidia. He and large numbers of captured Vandals are transported to Constantinople. The Vandal Kingdom ends, and the African provinces return to the Byzantine Empire.
• April – Belisarius leaves a small force in Africa under the Byzantine general Solomon, to continue the subjugation of the province. He is appointed governor (Exarch) and pacifies the Moorish tribes with success. Malta becomes a Byzantine province (until 870).
• October 2 – King Athalaric dies of tuberculosis, age 18, having dissipated his youth in drink and debauchery. His mother, Amalasuntha, proposes to her cousin Theodahad, the kingdom's largest landowner and her father's last male heir, that he share the throne with her but that he will be king of the Ostrogoths in name only. Theodahad has secret conversations with the Byzantine ambassador, and promises to turn over Tuscany in exchange for a large sum of money, the rank of senator, and permission to live at Constantinople.

535 CE28 entries

• April 30 – King Theodahad revenges himself upon Queen Amalasuintha. He has her taken from the capital of Ravenna to a small island on Lake Bolsena, where she is strangled in her bath.
• May 8 – Pope John II dies in Rome after a two-year reign, and is succeeded by Agapetus I as the 57th pope. Agapetus is sent by King Theodahad on an embassy to Constantinople.
• Justinian I issues the Lex Julia and declares that a wife has no right to bring criminal charges of adultery against a husband. This makes divorce almost impossible in the Byzantine Empire.

536 CE25 entries

537 CE26 entries

• March 2 – Siege of Rome: The Ostrogothic army (45,000 men) under King Vitiges begins the siege of the city. Belisarius conducts a delaying action outside the Flaminian Gate; he and a detachment of his bucellarii are almost cut off.
• April 9 – Belisarius receives his promised reinforcements: 1,600 cavalry, mostly of Hunnic or Slavic origin and expert bowmen. Despite shortages, he starts raids against the Gothic camps and Vitiges is forced into a stalemate.
• December – Belisarius sends John "the Sanguinary" with a force of 2,000 men towards Picenum, to plunder the east coast of Italy. He arrives at Ariminum (Rimini), where he is welcomed by the local population.

538 CE20 entries

• March 12 – Siege of Rome: King Vitiges of the Ostrogoths ends his siege (after 374 days) and abandons Rome. He retreats with his Gothic army northeast along the Via Flaminia.
• King Seong of Paekche (Korea) moves the capital from Ungjin (present-day Gongju) further south to Sabi (present-day Buyeo County), on the Geum River. He sends a diplomatic mission that formally introduces Buddhism to the Japanese imperial court (see also 552).
• The Kofun period ends and the Asuka period, the second part of the Yamato period in Japan, begins.

539 CE10 entries

• March – Gothic War: The Goths and the Burgundians recapture Mediolanum (modern Milan), after many months of siege, the city reaching the point of starvation. The Byzantine garrison (1,000 men) surrenders and is spared, but the inhabitants are massacred (according to Procopius 300,000 people are murdered), and the city itself is destroyed.
• Kinmei succeeds his brother Senka, and ascends as 29th emperor to the throne of Japan.
• Belisarius, still besieging Ravenna, negotiates a treaty with Theodebert I (whose forces are suffering from dysentery), and the Franks retreat to Gaul. The Byzantine fleet controls the Adriatic Sea and blockades the port of the capital from supplies.