TDIH - January 23 This Day in (Medieval) History: January 23 667 – Death of Ildefonsus, bishop of Toledo. 989 – Death of Adalbero, archbishop of Reims. 1002 – Death of Otto III, Holy Roman Emperor. 1199 – Death of Abu Yusuf Yaqub al-Mansur, caliph of the Mu?minid dynasty of Spain and North Africa. 1252 – Death of Queen Isabella of Armenia. 1264 – King Louis IX of France handed down the Mise of Amiens in support of King Henry III of England against rebellious nobles led by Simon de Montfort. 1350 – Birth of St. Vincent Ferrer, Spanish missionary. 1378 – Birth of Louis III, Elector Palatine of the Holy Roman Empire. 1297 – Death of Florent of Hainaut, Prince of Achaea. 1423 – Death of Margaret of Bavaria, wife of Duke John-the-Fearless of Burgundy. 1516 – Death of King Ferdinand II of Aragon.