- Feb 18 Nasir al-Din al-Tusi, Persian philosopher, architect and mathematician (Tadhkirah fi ʿilm al-hay), born in Ṭūs, Khorāsān (d. 1274)
- 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)