Year 1390 (MCCCXC) was a common year starting on Saturday (link will display full calendar) of the Julian calendar. Events April 14 – John VII Palaiologos overthrows his grandfather, John V Palaiologos, as Byzantine Emperor. April 19 – Robert III succeeds his father, Robert II, as King of Scotland. September 17 – John VII Palaiologos seeks refuge with the Ottoman sultan Bayezid I after John V Palaiologos is restored by his son, Manuel, and the Republic of Venice. October 9… (More on 1390)