May 15. May 15 is the 135th day of the year (136th in leap years) in the Gregorian calendar; 230 days remain until the end of the year. Events Pre-1600 221 ??? Liu Bei, Chinese warlord, proclaims himself emperor of Shu Han, the successor of the Han dynasty. 392 ??? Emperor Valentinian II is assassinated while advancing into Gaul against the Frankish usurper Arbogast. He is found hanging in his residence at Vienne. 589 ??? King Authari marries Theodelinda, daughter of the Bavarian duke Garibald I. A Catholic, she has great influence among the Lombard nobility. 756 ??? 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. 1252 ??? Pope Innocent IV issues the papal bull ad extirpanda, which authorizes, but also limits, the torture of heretics in the...