TDIH - February 5 This Day in (Medieval) History: February 5 523 – Death of Bishop Avitus of Vienne. 789 – Founding of the Idrisid Dynasty of Morocco by Idris I, who broke from the Abbasid caliphate to create his own jurisdiction. 994 – Death of William IV, Duke of Aquitaine. 1015 – Death of Saint Adelaide, German Abbess. 1036 – Death of Alfred Aetheling, one of the sons of King Aethelred. 1146 – Death of Zafadola, Emir of Zaragoza. 1321 – Birth of John II, Marquess of Montferrat. 1438 – Birth of Philip II, Duke of Savoy.