By 1223, William was a
canon at the
Notre Dame cathedral. Upon the death of the bishop of Paris,
Bartholomaeus (20 October 1227), the canons elected Nicolas as the next bishop. William was dissatisfied with this outcome and went to Rome to ask the Pope to intervene. Whilst in Rome he made such a strong impression on
Pope Gregory IX that the pope chose William in 1228 to be the next bishop of Paris. As
bishop of Paris, William was a strong supporter of the university although his episcopacy was not without controversy in the eyes of the university. Following a heavy-handed use of royal force, which led to several students being killed in Paris, university staff turned to William expecting him to defend them. His failure to do so led to a
university strike with many prominent masters and students leaving to go to other cities where they then founded new schools and universities. With the academic staff on strike William decided to appoint
Roland of Cremona OP to a master's chair in theology, thus beginning a long and distinguished tradition in which Dominican and Franciscan masters taught at the university. Whilst William was a strong advocate for the use of reason and academic study in theology, he also maintained that academic theology was at the service of the church and must conform to doctrinal requirements. As a result of this in January 1241 he published a list of 10 theological propositions which he condemned and ordered should not be taught at the university. During his episcopate he also took action against
prostitution in the city. In 1248, he served on the
Regency council during
Louis IX's absence on the
Seventh Crusade. ==Works==