May 21 in History 293 – Roman Emperors Diocletian and Maximian appoint Galerius as Caesar to Diocletian, beginning the period of four rulers known as the Tetrarchy. 878 – Syracuse, Sicily, is captured by the Muslim Aghlabids after a nine-month siege. 879 – Pope John VIII gives blessings to Branimir of Croatia and to the Croatian people, considered to be international recognition…
May 20 in History 325 – The First Council of Nicaea is formally opened, starting the first ecumenical council of the Christian Church. 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. 685 – The Battle of Dun Nechtain is…
May 18 in History 332 – Emperor Constantine the Great announces free distributions of food to the citizens in Constantinople. 872 – Louis II of Italy is crowned for the second time as Roman Emperor at Rome, at the age of 47. His first coronation was 28 years earlier, in…
May 17 in History 1395 – Battle of Rovine: The Wallachians defeat an invading Ottoman army. 1536 – George Boleyn, 2nd Viscount Rochford and four other men are executed for treason. 1536 – Henry VIII and Anne Boleyn’s marriage is annulled. 1590 – Anne of Denmark is crowned Queen of Scotland. 1642 – Paul de Chomedey, Sieur de Maisonneuve (1612–1676)…
May 16 in History 946 – Emperor Suzaku abdicates the throne in favor of his brother Murakami who becomes the 62nd emperor of Japan. 1204 – Having been elected on May 9, Baldwin IX, Count of Flanders is crowned as the first Emperor of the Latin Empire. 1426 – Gov. Thado of Mohnyin becomes king of Ava. 1527 –…
May 10 in History 28 BC – A sunspot is observed by Han dynasty astronomers during the reign of Emperor Cheng of Han, one of the earliest dated sunspot observations in China. 1291 – Scottish nobles recognize the authority of Edward I of England pending…
May 9 in History 1009 – Lombard Revolt: Lombard forces led by Melus revolt in Bari against the Byzantine Catepanate of Italy. 1271 – Ninth Crusade, Edward I of England disembarks at Acre. 1386 – England and Portugal formally ratify their alliance with the signing of the Treaty of Windsor, making it the oldest diplomatic alliance in the world which…
May 7 in History 351 – The Jewish revolt against Constantius Gallus breaks out after his arrival at Antioch. 558 – In Constantinople, the dome of the Hagia Sophia collapses, twenty years after its construction. Justinian I immediately orders that the dome be rebuilt.…
This day marks the approximate midpoint of spring in the Northern Hemisphere and of autumn in the Southern Hemisphere (starting the season at the March equinox). May 5 in History 553 – The Second Council of Constantinople begins 1215 – Rebel barons renounce…
May 3 in History 752 – Mayan king Bird Jaguar IV of Yaxchilan in modern-day Chiapas, Mexico assumes the throne. 1294 – John II becomes Duke of Brabant, Lothier and Limburg. 1481 – The largest of three earthquakes strikes the island of Rhodes and causes an estimated 30,000 casualties. 1491 – Kongo monarch Nkuwu…