1st day events in history

January 1, 69 The Roman legions in Germania Superior refuse to swear loyalty to Galba. They rebel and proclaim Vitellius as emperor
July 1, 69 Tiberius Julius Alexander orders his Roman legions in Alexandria to swear allegiance to Vespasian as Emperor
August 1, 69 Batavian rebellion: The Batavians in Germania Inferior (Netherlands) revolt under the leadership of Gaius Julius Civilis
January 1, 193 The Senate chooses Pertinax against his will to succeed Commodus as Roman emperor
June 1, 193 The Roman Emperor Didius Julianus is assassinated
April 1, 286 Emperor Diocletian elevates his general Maximian to co-emperor with the rank of Augustus and gives him control over the Western regions of the Roman Empire
March 1, 293 Emperor Diocletian and Maximian appoint Constantius Chlorus and Galerius as Caesars. This is considered the beginning of the Tetrarchy, known as the Quattuor Principes Mundi ("Four Rulers of the World")
May 1, 305 Diocletian and Maximian retire from the office of Roman Emperor
March 1, 317 Crispus and Constantine II, sons of Roman Emperor Constantine I, and Licinius Iunior, son of Emperor Licinius, are made Caesares
April 1, 325 Crown Prince Jin Chengdi, age 4, succeeds his father Jin Mingdi as emperor of the Eastern Jin Dynasty
March 1, 350 Vetranio is asked by Constantina, sister of Constantius II, to proclaim himself Caesar
November 1, 365 The Alemanni cross the Rhine and invade Gaul. Emperor Valentinian I moves to Paris to command the army and defend the Gallic cities
January 1, 404 An infuriated Roman mob tears Telemachus, a Christian monk, to pieces for trying to stop a gladiators' fight in the public arena held in Rome
January 1, 414 Galla Placidia, half-sister of Emperor Honorius, is married to the Visigothic king Ataulf at Narbonne. The wedding is celebrated with Roman festivities and magnificent gifts from the Gothic booty
January 1, 417 Emperor Honorius forces Galla Placidia into marriage to Constantius, his famous general (magister militum)
April 1, 457 Majorian is acclaimed emperor by the Roman army
September 1, 462 Possible start of first Byzantine indiction cycle
February 1, 481 Vandal king Huneric organises a conference between Catholic and Arian bishops at Carthage
May 1, 524 King Sigismund of Burgundy is executed at Orléans after an 8-year reign and is succeeded by his brother Godomar
April 1, 527 Byzantine Emperor Justin I names his nephew Justinian I as co-ruler and successor to the throne
August 1, 527 Justinian I becomes the sole ruler of the Byzantine Empire
April 1, 528 The daughter of Emperor Xiaoming of Northern Wei was made the "Emperor" as a male heir of the late emperor by Empress Dowager Hu, deposed and replaced by Yuan Zhao the next day; she was the first female monarch in the History of China, but not widely recognised
July 1, 552 Battle of Taginae: Byzantine forces under Narses defeat the Ostrogoths in Italy. During the fightings king Totila is mortally wounded
August 1, 607 Ono no Imoko is dispatched as envoy to the Sui court in China (Traditional Japanese date: July 3, 607)
September 1, 717 Siege of Constantinople: The Muslim armada with 1,800 ships, is defeated by the Byzantine navy through the use of Greek fire
December 1, 800 Charlemagne judges the accusations against Pope Leo III in the Vatican
May 1, 880 The Nea Ekklesia is inaugurated in Constantinople, setting the model for all later cross-in-square Orthodox churches
August 1, 902 Taormina, the last Byzantine stronghold in Sicily, is captured by the Aghlabids army, concluding the Muslim conquest of Sicily
October 1, 959 Edgar the Peaceful becomes king of all England
November 1, 996 Emperor Otto III issues a deed to Gottschalk, Bishop of Freising, which is the oldest known document using the name Ostarrîchi (Austria in Old High German)
January 1, 1001 Grand Prince Stephen I of Hungary is named the first King of Hungary by Pope Sylvester II
January 1, 1068 Romanos IV Diogenes marries Eudokia Makrembolitissa and is crowned Byzantine Emperor
July 1, 1097 Battle of Dorylaeum: Crusaders led by prince Bohemond of Taranto defeat a Seljuk army led by sultan Kilij Arslan I
November 1, 1141 Empress Matilda's reign as 'Lady of the English' ends with Stephen of Blois regaining the title of King of England
November 1, 1179 Philip II is crowned King of France
August 1, 1192 Richard the Lionheart landed on Jaffa and defeated the army of Saladin
August 1, 1203 Isaac II Angelos, restored Eastern Roman Emperor, declares his son Alexios IV Angelos co-emperor after pressure from the forces of the Fourth Crusade
November 1, 1214 The port city of Sinope surrenders to the Seljuq Turks
June 1, 1215 Zhongdu (now Beijing), then under the control of the Jurchen ruler Emperor Xuanzong of Jin, is captured by the Mongols under Genghis Khan, ending the Battle of Zhongdu
June 1, 1252 Alfonso X is elected King of Castile and León
January 1, 1259 Michael VIII Palaiologos is proclaimed co-emperor of the Empire of Nicaea with his ward John IV Laskaris
September 1, 1270 King Stephen V of Hungary writes his walk to the antiquum castellum near Miholjanec, where the Sword of Attila was recently discovered
August 1, 1291 The Old Swiss Confederacy is formed with the signature of the Federal Charter
April 1, 1293 Robert Winchelsey leaves England for Rome, to be consecrated as Archbishop of Canterbury
June 1, 1298 Residents of Riga and Grand Duchy of Lithuania defeated the Livonian Order in the Battle of Turaida
April 1, 1318 Berwick-upon-Tweed is captured by the Scottish from England
February 1, 1327 Teenaged Edward III is crowned King of England, but the country is ruled by his mother Queen Isabella and her lover Roger Mortimer
May 1, 1328 Wars of Scottish Independence end: By the Treaty of Edinburgh–Northampton the Kingdom of England recognises the Kingdom of Scotland as an independent state
February 1, 1329 King John of Bohemia captures Medvėgalis, an important fortress of the pagan Grand Duchy of Lithuania, and baptizes 6,000 of its defenders
April 1, 1340 Niels Ebbesen kills Gerhard III of Holstein in his bedroom, ending the 1332-1340 interregnum in Denmark