Historical Events in 1120
- Jan 16 The Council of Nablus is held, establishing the earliest surviving written laws of the Crusader Kingdom of Jerusalem
- May 27 Richard III of Capua is anointed as prince two weeks before his untimely death
- Jul 4 Jordan II of Capua is anointed as prince after his infant nephew's death
Famous People Who Died in 1120
- Sep 24 Welf II, Duke of Bavaria (b. 1072)
- Nov 25 William Adelin, son and heir of Henry I of England (b. 1104) dies in White Ship tragedy trying to save his illegitimate half-sister Countess of Perche while crossing the English Channel