May 9328 – Athanasius is elected Patriarch of Alexandria. 1009 – Lombard Revolt: Lombard forces led by Melus revolt in Bari against the Byzantine Catepanate of Italy. 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 is still in force. 1450 – 'Abd al-Latif (Timurid monarch) is assassinated. 1540 – Hernando de Alarcón sets sail on an expedition to the Gulf of California. 1662 – The figure who later became Mr.
December 21AD 69 – The Roman Senate declares Vespasian emperor of Rome, the last in the Year of the Four Emperors. 1124 – Pope Honorius II is consecrated, having been elected after the controversial dethroning of Pope Celestine II. 1140 – After a siege of several weeks, the city of Weinsberg and its castle surrender to Conrad III of Germany. 1237 – The city of Ryazan is sacked by the Mongol army of Batu Khan. 1361 – The Battle of Linuesa is fought in the context of the Spanish Reconquista between the forces of the Emirate of Granada and the combined army of the Kingdom of Castile and of Jaén resulting in a Castilian victory.
May 25567 BC – Servius Tullius, the king of Rome, celebrates a triumph for his victory over the Etruscans. 240 BC – First recorded perihelion passage of Halley's Comet. 1085 – Alfonso VI of Castile takes Toledo, Spain, back from the Moors. 1420 – Henry the Navigator is appointed governor of the Order of Christ. 1521 – The Diet of Worms ends when Charles V, Holy Roman Emperor, issues the Edict of Worms, declaring Martin Luther an outlaw.
October 32457 BC – Gaecheonjeol, Hwanung (환웅) purportedly descended from heaven. South Korea's National Foundation Day. 52 BC – Gallic Wars: Vercingetorix, leader of the Gauls, surrenders to the Romans under Julius Caesar, ending the siege and battle of Alesia. 42 BC – Liberators' civil war: Triumvirs Mark Antony and Octavian fight to a draw Caesar's assassins Brutus and Cassius in the first part of the Battle of Philippi, where Cassius commits suicide believing the battle is lost.
April 29801 – An earthquake in the Central Apennines hits Rome and Spoleto, damaging the basilica of San Paolo Fuori le Mura. 1091 – Battle of Levounion: The Pechenegs are defeated by Byzantine Emperor Alexios I Komnenos. 1386 – Battle of the Vikhra River: The Principality of Smolensk is defeated by the Grand Duchy of Lithuania and becomes its vassal. 1429 – Joan of Arc arrives to relieve the Siege of Orléans. 1483 – Gran Canaria, the main island of the Canary Islands, is conquered by the Kingdom of Castile.
April 27247 – Philip the Arab marks the millennium of Rome with a celebration of the ludi saeculares. 395 – Emperor Arcadius marries Aelia Eudoxia, daughter of the Frankish general Flavius Bauto. She becomes one of the more powerful Roman empresses of Late Antiquity. 711 – Islamic conquest of Hispania: Moorish troops led by Tariq ibn Ziyad land at Gibraltar to begin their invasion of the Iberian Peninsula (Al-Andalus). 1296 – First War of Scottish Independence: John Balliol's Scottish army is defeated by an English army commanded by John de Warenne, 6th Earl of Surrey at the Battle of Dunbar.
August 2519 – The Roman general Germanicus dies near Antioch. He was convinced that the mysterious illness that ended in his death was a result of poisoning by the Syrian governor Gnaeus Calpurnius Piso, whom he had ordered to leave the province. 766 – Emperor Constantine V humiliates nineteen high-ranking officials, after discovering a plot against him. He executes the leaders, Constantine Podopagouros and his brother Strategios. 1248 – The Dutch city of Ommen receives city rights and fortification rights from Otto III, the Archbishop of Utrecht.
May 3752 – Mayan king Bird Jaguar IV of Yaxchilan in modern-day Chiapas, Mexico, assumes the throne. 1481 – The largest of three earthquakes strikes the island of Rhodes and causes an estimated 30,000 casualties. 1491 – Kongo monarch Nkuwu Nzinga is baptised by Portuguese missionaries, adopting the baptismal name of João I. 1568 – Angered by the brutal onslaught of Spanish troops at Fort Caroline, a French force burns the San Mateo fort and massacres hundreds of Spaniards. 1616 – Treaty of Loudun ends a French civil war.
May 2617 – Germanicus celebrates a triumph in Rome for his victories over the Cherusci, Chatti, and other German tribes west of the Elbe. 451 – Battle of Avarayr between Armenian rebels and the Sasanian Empire takes place. The Sasanids defeat the Armenians militarily but guarantee them freedom to openly practice Christianity. 946 – King Edmund I of England is murdered by a thief whom he personally attacks while celebrating St Augustine's Mass Day. 961 – King Otto I elects his six-year-old son Otto II as heir apparent and co-ruler of the East Frankish Kingdom.
May 16946 – Emperor Suzaku abdicates the throne in favor of his brother Murakami who becomes the 62nd emperor of Japan. 1204 – Baldwin IX, Count of Flanders is crowned as the first Emperor of the Latin Empire. 1364 – Hundred Years' War: Bertrand du Guesclin and a French army defeat the Anglo-Navarrese army of Charles the Bad at Cocherel. 1426 – Gov. Thado of Mohnyin becomes king of Ava. 1527 – The Florentines drive out the Medici for a second time and Florence re-establishes itself as a republic.
