1311

1311 (MCCCXI) was a common year starting on Friday of the Julian calendar, the 1311th year of the Common Era (CE) and Anno Domini (AD) designations, the 311th year of the 2nd millennium, the 11th year of the 14th century, and the 2nd year of the 1310s decade. As of the start of 1311, the Gregorian calendar was 8 days ahead of the Julian calendar, which was the dominant calendar of the time.

Millennium:	2nd millennium
Centuries:	13th century – 14th century – 15th century
Decades:	1280s  1290s  1300s  – 1310s –  1320s  1330s  1340s
Years:	1308 1309 1310 – 1311 – 1312 1313 1314

Events

• March 15 – At the Battle of Halmyros, the Catalan Company beats Walter V of Brienne to take the Duchy of Athens.
• Bolingbroke Castle gets into the House of Lancaster.

Births

• June 24 – Philippa of Hainault, queen of Edward III of England (died 1369)
• August 13 – King Alfonso XI of Castile (died 1350)
• Peter I, Duke of Bourbon (died 1356)
• Margaret II, Countess of Hainaut (died 1356)
• Joan II of Navarre, daughter of King Louis X of France (died 1349)
• July 1 – Liu Ji, Chinese military strategist, officer, statesman and poet (d. 1375)

Deaths

• March 15 – Walter V of Brienne, Duke of Athens
• Antony Bek, bishop of Durham
• David VIII of Georgia (born 1273)
• James II of Majorca (born 1243)
• Bernard Saisset, Occitan bishop of Pamiers (born 1232)
• Arnold of Villanova, Spanish alchemist and physician (born 1235)
• Emperor Wuzong of Yuan China