Year 1366 (MCCCLXVI) was a common year starting on Thursday of the Julian calendar.
Events
- March 13 – Henry II deposes his half-brother, Pedro of Castile, to become King of Castile.
- October 12 – Frederick III of Sicily forbids decorations on synagogues.
- October 26 – Comet 55P/Tempel–Tuttle passes from Earth.
Date unknown
- War continues between the Hindu Vijayanagar Empire and the Muslim Bahmani Sultanate in modern-day southern India.
- Dmitri Donskoi, ruler of Moscow and Vladimir, makes peace with Dmitri Konstantinovich, former ruler of Vladimir.
- Abu Faris Abd al-Aziz I of Morocco succeeds assassinated Abu Zayyan as Sultan of the Marinid Empire in Morocco.
- The Statutes of Kilkenny are passed, aiming to curb the decline of the Hiberno-Norman Lordship of Ireland.
- The Den Hoorn brewery is founded at Leuven in the Low Countries. In 1717 this will be renamed the Brouwerij Artois, and later releases a beer in 1926 named Stella Artois.
- Zhu Yuanzhang, leader of the Red Turban Rebellion that will overthrow the Yuan dynasty and establish the Ming dynasty two years later, begins building the walls for a new capital city at Nanjing.
- Thomas Fraser obtains lands in Aberdeenshire (Scotland) on which he starts the building of a towerhouse, that will later be known as Muchalls Castle.
Births
- May 11 – Anne of Bohemia, queen of Richard II of England (d. 1394)
- August 28 – Jean Le Maingre, marshal of France (d. 1421)
- date unknown
- Lady Elizabeth FitzAlan, English noblewoman (d. 1425)
- Miran Shah, governor of Azerbaijan (d. 1408)
- Approximate
- Eleanor de Bohun, English noble (d.1399)
Deaths
- January 25 – Henry Suso, German mystic (b. c. 1295)
- April 26 – Simon Islip, Archbishop of Canterbury
- May 20 – Maria of Calabria, Empress of Constantinople (b. 1329)
- Summer – Ming Yuzhen, founder of the rebel empire of Daxia (b. 1331)
- October 14 – Ibn Nubata, Arab poet (b. 1287)
- October 18 – Petrus Torkilsson, Archbishop of Uppsala