Year 1311 (MCCCXI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. Events of 1311 March 15 – Battle of Halmyros: The Catalan Company defeats Walter V of Brienne to take control of the Duchy of Athens. Undated A committee of 21 English barons draw up a series of ordinances, which substitute ordainers for the King (Edward II) as the effective government of the country. Bolingbroke Castle passes to the House of Lancaster. Births June 2… (More on 1311)