1160-1215. Bishop of Cremona. He studied in Bologna and taught canon law and theology at Paris, thereafter teaching in the cathedral school of Mainz before becoming bishop of Cremona in 1185. He won the city's independence from , defended it against Brescia and Milan, and planned its fortifications. In 1202-5 he assisted the papal mission of Peter of Capua in Armenia and Constantinople. His chief works are Mitrale (1200), on liturgy; Chronica universalis (1213), a history from Creation, especially valuable for the Fourth Crusade; and Summa decretorum, his Paris lectures reworked at Mainz following only the form of Gratian's Decretum.