- Guido Le Gros
- Guy le gros Foulques
Married, and father of two daughters. Lay adviser of King Louis IX of France. Widower. Priest. Bishop of Le Puy-en-Velay, France in 1256. Archbishop of Narbonne, France in 1259. Cardinal–bishop of Sabina in December 1261. Papal legate. 183rd pope. Worked against the House of Hohenstaufens by confirming the agreement that gave Charles of Anjou, youngest brother of King Louis IX, the crown of Naples and an army so he could keep it. When Conradin attacked Charles, Clement preached crusade against him. Strong opponent of nepotism in church and civil government. Patron of Roger Bacon.