Pope Innocent III, born Lotario dei Conti di Segni, was the head of the Catholic Church and ruler of the Papal States from 8 January 1198 until his death on 16 July 1216.
Detail of a fresco at the cloister Sacro Speco, c. 1219
Bulla of Innocent III
Innocent launched the Albigensian Crusade against the Cathars.
Tomb of Pope Innocent III at Saint John Lateran basilica
Decretals are letters of a pope that formulate decisions in ecclesiastical law of the Catholic Church.
Breviarium extravagantium by Bernardus Papiensis, the first of the five collections called Compilationes Antiquae.
Collection of the Decretals. Illustration: Boniface VIII and his cardinals