1321
Year 1321 was a common year starting on Thursday of the Julian calendar.Events
January–December
- c. May-June - Leper scare: Rumours that lepers are attempting to poison the Christian population spread throughout southern France.
- August 14 - King Edward II of England reluctantly agrees to demands from his barons to send Hugh le Despenser, 1st Earl of Winchester, and his son Hugh Despenser the Younger into exile.
- October 29 - King Stephen Uroš II Milutin of Serbia dies. His son Stephen Constantine claims the throne, but Constantine's younger half-brother Stephen Uroš III Dečanski succeeds.
Date unknown
- The Byzantine civil war of 1321–28 begins, when Andronikos III Palaiologos initiates an uprising against Andronikos II Palaiologos.
- A bad harvest brings famine in Europe.
- The Anatolian beylik of Teke is established.
- Gračanica monastery in Kosovo is rebuilt by the Serbian king Stefan Milutin.
- Spitakavor Monastery is completed in Armenia.
- The University of Florence is established.
Births
- February 5 - John II, Marquess of Montferrat
- July 5 - Joan of The Tower, queen consort of Scotland
- August 29 - John of Artois, Count of Eu, French soldier
- date unknown
- * James I, Count of Urgell
- * Khwaja Bande Nawaz, Sufi saint
- probable - Emperor John III of Trebizond
Deaths
- January 12 or 1322 - Maria of Brabant, queen consort of Philip III of France
- January 13 - Bonacossa Borri, Lady of Milan
- February 25 - Beatrice d'Avesnes, consort of Henry VI, Count of Luxembourg
- March 18 - Matthew III Csák, Hungarian oligarch
- April 8 - Thomas of Tolentino, Italian Franciscan missionary, martyred
- April 17 - Infanta Blanche of Portugal, daughter of King Afonso III of Portugal and Urraca of Castile
- April 27 - Nicolò Albertini, Italian cardinal statesman
- May 31 - Birger, King of Sweden
- July 1 - María de Molina, queen consort of Castile
- September 13 or 14 - Dante Alighieri, Italian poet
- October 29 - Stefan Milutin, King of Serbia
- November 9 - Walter Langton, bishop of Lichfield and treasurer of England
- date unknown
- * Marianus III of Arborea, Giudice
- * Mubarak Khan, Khilji regent, murdered
- * Reginald of Burgundy, Count of Montbéliard
- * Witte van Haemstede, Dutch prince
- probable - Ibn al-Banna' al-Marrakushi, Arab mathematician