The 510s decade ran from January 1, 510, to December 31, 519. Events and trendsPossible timing of King Arthur's victory over the Saxons512—Roman (Byzantine) Emperor Anastasius I ends a period of moderate eclectic policy, and starts strongly favoring his own monophysitist beliefs.512—Earliest known dated text in the Arabic alphabet, at Zebed in Syria512—The island nation of Usan-guk is conquered by the Korean Silla Dynasty general Lee Sabu.516—Sigismund becomes king of Bu… (More on 510s)