Died in 1231

Apr 6 William Marshal 2nd Earl of Pembroke a medieval English nobleman and was one of the Magna Carta sureties. He fought during the First Barons' War and was present at the Battle of Lincoln
May 7 Beatrice II Countess of Burgundy Duchess consort of Merania. She was a member of the Swabian Hohenstaufen dynasty, the daughter of Count Otto I of Burgundy and Margaret of Blois, thereby a granddaughter of Emperor Frederick Barbarossa
Jun 13 Anthony of Padua Saint Anthony of Padua, O.F.M. also known as Anthony of Lisbon, was a Portuguese Catholic priest and friar of the Franciscan Order. Though he died in Padua, Italy, he was born and raised by a wealthy family in Lisbon. Noted by his contemporaries for his forceful preaching and expert knowledge of scripture, he was the second-fastest canonized saint and proclaimed a Doctor of the Church on 16 January 1946. He is also the patron saint of finding things or lost people
Aug 3 Richard le Grant Archbishop of Canterbury from 1229 to 1231.
Sep 15 Louis I Duke of Bavaria the Duke of Bavaria in 1183 and Count Palatine of the Rhine in 1214. He was a son of Otto I and his wife Agnes of Loon. Louis was married to Ludmilla, a daughter of Duke Frederick of Bohemia
Nov 3 Władysław III Spindleshanks Duke of Greater Poland , High Duke of Poland and Duke of Kraków during 1202–1206 and 1228–1231, Duke of Kalisz during 1202–1206, ruler of Lubusz during 1206–1210 and 1218–1225, and ruler over Gniezno during 1216–1217.
Nov 6 Emperor Tsuchimikado the 83rd emperor of Japan, according to the traditional order of succession.
Nov 17 Elizabeth of Hungary a princess of the Kingdom of Hungary, Landgravine of Thuringia, Germany and a greatly venerated Catholic saint. Elizabeth was married at the age of 14, and widowed at 20. After her husband's death she sent her children away and regained her dowry, using the money to build a hospital where she herself served the sick. She became a symbol of Christian charity after her death at the age of 24 and was quickly canonized
Dec 25 Folquet de Marselha alternatively Folquet de Marseille, Foulques de Toulouse, Fulk of Toulouse came from a Genoese merchant family who lived in Marseille. He is known as a trobadour, and then as a fiercely anti-Cathar bishop of Toulouse