Pope Alexander II Sends a Force Against the Muslim-held Fortress of Barbastro

Pope Alexander II sends a combined force of Italian, Norman, French, and Spanish knights against the Muslim-held fortress of Barbastro in the north, massacring many inhabitants and enslaving the rest. The Almoravid leader, Yusuf ibn Tashufin, founds the capital city of Marrakesh and begins expanding his empire northward throughout Morocco and Algeria.