Historical Events in 1248 May 15 Archbishop Konrad von Hochstaden lays cornerstone for Cologne Cathedral Aug 15 Construction of Cologne Cathedral begun Aug 25 The Dutch city of Ommen receives city rights and fortification rights from Otto III, the Archbishop of Utrecht. Nov 1 Earl Willem II of Holland crowned as RC German emperor Nov 23 Conquest of Seville by Christian troops under King Ferdinand III of Castile after the city capitulates Famous People Who Died in 1248 Jan 4 Sancho II, King of Portugal (1223-47), dies at 41 Feb 1 Hendrik II, Duke of Brabant (1235-48), dies at 40 1247 History by Year 1249