Major Events Feb 22 Battle of Cassel; Robert I the Frisian defeats Arnulf III/I Apr 16 Bari falls to Robert Guiscard's Norman forces, ending Byzantine rule in Italy Aug 26 Battle of Manzikert: Seljuq Turks led by sultan Alp Arslan beat and capture Byzantine Emperor Romanos IV Diogenes Born in 1071 Oct 22 William IX, the Troubadour, Frankish nobleman (Duke of Aquitaine, Duke of Gascony, Count of Poitou, 1086-1127), Crusader, and poet, born in Aquitaine (d. 1127) Who Died in 1071 Feb 22 Arnulf III, earl of Flanders/Hainault (Arnulf I), dies in battle 1070 History by Year 1072 World Leaders in 1071 Henry IV