- Feb 18 Nasir al-Din al-Tusi, Persian philosopher, architect and mathematician (Tadhkirah fi ʿilm al-hay), born in Ṭūs, Khorāsān (d. 1274)
- May 30 Theobald de Champagne, French ruler (Count of Champagne; King of Navarre, 1234-53), poet, and troubadour, born in Troyes, County of Champagne (d. 1253)
- Aug 9 Arnold Fitz Thedmar, English chronicler of the mayors and sheriffs of London in 1188–1274, born in London (d. 1274, death reported 1275)
- Oct 9 Robert de Sorbon, French theologian and founder of the Sorbonne College, born in Sorbon, France (d. 1274)
20-29
30-39
40-49
50-59
80-89
Over 90