May 14 Battle of Lewes, 2nd Barons' War: Simon de Montfort the younger, Earl of Leicester, defeats English King Henry III
Jun 18 The Parliament of Ireland meets at Castledermot in County Kildare, the first definitively known meeting of this Irish legislature
Aug 5 Anti-Jewish riots break out in Arnstadt Germany
Aug 21Kublai Khan accepts the surrender of his younger brother Ariq Böke at Xanadu, at the end of the Mongol civil war
Sep 8 The Statute of Kalisz, guaranteeing Jews safety and personal liberties and giving battei din jurisdiction over Jewish matters, is promulgated by Boleslaus the Pious, Duke of Greater Poland.
Oct 3 Comet said to predict death of Pope Urban IV is last seen
Kublai Khan