On what date did XXX end?
Battle of Halmyros
The Battle of Halmyros, known by older scholars as the Battle of the Cephissus or Battle of Orchomenos, was fought on 15 March 1311 between the forces of the Frankish Duchy of Athens and its vassals under Walter of Brienne and the mercenaries of the Catalan Company, resulting in a devastating victory for the Catalans.
15 March 1311