Historical Events in 523 AD Aug 6 Pope Hormisdas reign as Catholic Pope ends with his death Aug 13 St John I begins his reign as Catholic Pope Famous People Who Died in 523 AD May 6 Thrasamund, King of Vandals and Alans (496-523) Aug 6 Hormisdas, Pope (514-23) reunited Eastern and Western Churches, dies 521 AD History by Year 524 AD