Died in 1312

Jan 23 Isabella of Villehardouin the elder daughter of William II of Villehardouin, Prince of Achaea, and of his second wife Anna, the third daughter of Michael II Komnenos Doukas, the despot of Epiros.
Mar 10 Casimir of Bytom a Duke of Opole during 1282–1284 and Duke of Bytom from 1284 until his death.
May 1 Paul I Šubić of Bribir a Croatian leader and most outstanding member of the Šubić noble family from Bribir. He was the Ban of Croatia from 1275 and Lord of all of Bosnia from 1305 until his death in 1312. He ruled from his seat in the fortified town of Bribir, where he erected, along with his castle, the three-aisled basilica of Mary inside the Franciscan convent
May 13 Theobald II Duke of Lorraine the duke of Lorraine from 1303 to his death. He was the son and successor of Frederick III and Margaret, daughter of King Theobald I of Navarre
Jun 19 Piers Gaveston 1st Earl of Cornwall an English nobleman of Gascon origin, and the favourite of King Edward II of England.
Jul 3 Marino Zorzi the 50th doge of the Republic of Venice, from August 23, 1311 to his death. He was married to Agneta Querini. Considered to have been a devout man, he had served as an ambassador to Rome. He may have been elected to decrease tensions in the city caused by the attempted revolt of Bajamonte Tiepolo as well as tensions with Rome, still angry with Venice over her occupation of the city of Ferrara
Aug 27 Arthur II Duke of Brittany Duke of Brittany from 1305 to his death. He was the first son of John II and Beatrice, daughter of Henry III of England and Eleanor of Provence
Sep 7 Ferdinand IV of Castile a king of Castile and León and Galicia. He was a son of Sancho El Bravo and his wife Maria de Molina
Oct 27 John II Duke of Brabant Duke of Brabant, Lothier and Limburg. He was the son of John I of Brabant and Margaretha of Flanders, daughter of Guy of Dampierre
Oct 28 Elizabeth of Carinthia Queen of Germany Queen of the Romans, Queen of Germany and Duchess of Austria by marriage. She is also known as Elizabeth of Tyrol
Nov 9 Otto III Duke of Bavaria Duke of Lower Bavaria from 1290 to 1312 and disputably King of Hungary and Croatia between 1305 and 1307 as Béla V.