馃搮 Today in HistoryMay 15
Liu Bei, Chinese warlord, proclaims himself emperor of Shu Han, the successor of the Han dynasty.
Emperor Valentinian II is assassinated while advancing into Gaul against the Frankish usurper Arbogast. He is found hanging in his residence at Vienne.
King Authari marries Theodelinda, daughter of the Bavarian duke Garibald I. A Catholic, she has great influence among the Lombard nobility.
Abd al-Rahman I, the founder of the Arab dynasty that ruled the greater part of Iberia for nearly three centuries, becomes emir of Cordova, Spain.
Michael the Syrian reconsecrates the Mor Bar Sauma Monastery, which he reconstructed after its destruction by a fire. The monastery stays a center of the Syriac Orthodox Church until the end of the thirteenth century.
Pope Innocent IV issues the papal bull ad extirpanda, which authorizes, but also limits, the torture of heretics in the Medieval Inquisition.

Insurgent peasants led by Anabaptist pastor Thomas M眉ntzer were defeated at the Battle of Frankenhausen, ending the German Peasants' War in the Holy Roman Empire.
Anne Boleyn, Queen of England, stands trial in London on charges of treason, adultery and incest; she is condemned to death by a specially-selected jury.
Johannes Kepler confirms his previously rejected discovery of the third law of planetary motion (he first discovered it on March 8 but soon rejected the idea after some initial calculations were made).