Mar 6 Omar ibn Ibrahim al-Chajjam completes Jalali-calendar Mar 16 Iran adopts solar Hijrah calendar Apr 11 Bishop Stanislaus of Kraków is executed by order of Bolesław II of Poland 1077 Historical Events by Year 1080 Medieval Popes Gregory I Gregory XIII Julius II Julius III Leo X Pius V
Gregory I
Gregory XIII
Julius II
Julius III
Leo X
Pius V