May events in history

May 26, 17 Germanicus returns to Rome as a conquering hero; he celebrates a triumph for his victories over the Cherusci, Chatti and other German tribes west of the Elbe
May 10, 70 Siege of Jerusalem: Titus, son of emperor Vespasian, opens a full-scale assault on Jerusalem and attacks the city's Third Wall to the northwest
May 30, 70 Siege of Jerusalem: Titus and his Roman legions breach the Second Wall of Jerusalem. The Jewish defenders retreat to the First Wall. The Romans build a circumvallation, cutting down all trees within fifteen kilometres
May 16, 218 Julia Maesa, aunt of the assassinated Caracalla, is banished to her home in Syria by the self-proclaimed emperor Macrinus and declares her 14-year old grandson Elagabalus, emperor of Rome
May 12, 254 Pope Stephen I succeeds Pope Lucius I as the 23rd pope
May 21, 293 Roman Emperors Diocletian and Maximian appoint Galerius as Caesar to Diocletian, beginning the period of four rulers known as the Tetrarchy
May 12, 304 Roman Emperor Diocletian orders the beheading of the 14-year-old Pancras of Rome
May 1, 305 Diocletian and Maximian retire from the office of Roman Emperor
May 20, 325 The First Council of Nicea – the first Ecumenical Council of the Christian Church is held
May 11, 330 Byzantium is renamed Nova Roma during a dedication ceremony, but it is more popularly referred to as Constantinople
May 18, 332 Constantine the Great announced free distributions of food to the citizens in Constantinople
May 7, 351 The Jewish revolt against Gallus breaks out. After his arrival at Antioch, the Jews begin a rebellion in Palestine
May 29, 363 The Roman emperor Julian defeats the Sassanid army in the Battle of Ctesiphon, under the walls of the Sassanid capital, but is unable to take the city
May 15, 392 Emperor Valentinian II is assassinated while advancing into Gaul against the Frankish usurper Arbogast. He is found hanging in his residence at Vienne
May 8, 413 Emperor Honorius signs an edict providing tax relief for the Italian provinces Tuscia, Campania, Picenum, Samnium, Apulia, Lucania and Calabria, which were plundered by the Visigoths
May 26, 451 Battle of Avarayr between Armenian rebels and the Sassanid Empire takes place. The Empire defeats the Armenians militarily but guarantees them freedom to openly practice Christianity
May 31, 455 Emperor Petronius Maximus is stoned to death by an angry mob while fleeing Rome
May 20, 491 Empress Ariadne marries Anastasius I. The widowed Augusta is able to choose her successor for the Byzantine throne, after Zeno (late emperor) dies of dysentery
May 1, 524 King Sigismund of Burgundy is executed at Orléans after an 8-year reign and is succeeded by his brother Godomar
May 20, 526 An earthquake kills about 250,000 people in what is now Syria and Antiochia
May 31, 526 A devastating earthquake strikes Antioch, Turkey, killing 250,000
May 5, 553 The Second Council of Constantinople begins
May 7, 558 In Constantinople, the dome of the Hagia Sophia collapses. Justinian I immediately orders that the dome be rebuilt
May 8, 589 Reccared I summons the Third Council of Toledo
May 15, 589 King Authari marries Theodelinda, daughter of the Bavarian duke Garibald I. A Catholic, she has great influence among the Lombard nobility
May 28, 621 Battle of Hulao: Li Shimin, the son of the Chinese emperor Gao Zu, defeats the numerically superior forces of Dou Jiande near the Hulao Pass (Henan). This victory decides the outcome of the civil war that followed the Sui Dynasty's collapse in favour of the Tang Dynasty
May 19, 639 Ashina Jiesheshuai and his tribesmen assaulted Tai zong at Jiucheng Palace
May 20, 685 The Battle of Dun Nechtain is fought between a Pictish army under King Bridei III and the invading Northumbrians under King Ecgfrith, who are decisively defeated
May 19, 715 Pope Gregory II is elected
May 3, 752 Mayan king Bird Jaguar IV of Yaxchilan in modern-day Chiapas, Mexico assumes the throne
May 23, 844 Battle of Clavijo: The Apostle Saint James the Greater is said to have miraculously appeared to a force of outnumbered Asturians and aided them against the forces of the Emir of Cordoba
May 22, 853 A Byzantine fleet sacks and destroys undefended Damietta in Egypt
May 11, 868 A copy of the Diamond Sutra is printed in China, making it the oldest known dated printed book
May 21, 878 Syracuse, Sicily, is captured by the Muslim sultan of Sicily
May 21, 879 Pope John VIII gives blessings to Branimir of Croatia and to the Croatian people, considered to be international recognition of the Croatian state
May 1, 880 The Nea Ekklesia is inaugurated in Constantinople, setting the model for all later cross-in-square Orthodox churches
May 12, 907 Zhu Wen forces Emperor Ai into abdicating, ending the Tang Dynasty after nearly three hundred years of rule
May 11, 912 Alexander becomes Emperor of the Byzantine Empire
May 12, 922 After much hardship, Abbasid envoy Ahmad ibn Fadlan arrived in the lands of Volga Bulgars
May 27, 927 Death of Simeon I the Great, the first Bulgarian to be recognized as Emperor
May 26, 946 King Edmund I of England is murdered by a thief whom he personally attacks while celebrating St Augustine's Mass Day
May 21, 996 Sixteen-year-old Otto III is crowned Holy Roman Emperor
May 19, 1051 Henry I of France is married to Anne of Kiev
May 21, 1085 The Swedish town of Helsingborg is founded
May 25, 1085 Alfonso VI of Castile takes Toledo, Spain, back from the Moors
May 9, 1092 Lincoln Cathedral is consecrated
May 18, 1096 First Crusade: around 800 Jews are massacred in Worms, Germany
May 29, 1108 Battle of Uclés: Almoravid troops under the command of Tamim ibn Yusuf defeat a Castile and León alliance under the command of Prince Sancho Alfónsez
May 27, 1120 Richard III of Capua is anointed as Prince two weeks before his untimely death
May 26, 1135 Alfonso VII of León and Castile is crowned in León Cathedral as Imperator totius Hispaniae, "Emperor of all of Spain"