While he was in
Rome on the business of the order,
Pope Honorius III created him cardinal, on 8 January 1219, and later charged him as
Papal legate with two important
missions: one in France (1220–23), to suppress the
Albigenses; the other in Germany (1224–26), to promote the crusade which Emperor
Frederick II had vowed to undertake (the eventual
Sixth Crusade). Conrad's success in both these missions was modest, but he was more successful in the improvement of ecclesiastical and monastic discipline through the arrangement of synods and the foundation of monasteries, as well as in the advancement of the
Dominicans - their foundation-house in Toulouse (1214) was ideally placed as an anvil for his function as third Legate to the Albigensian crusade. During this period he also issued statutes to the medical faculty at the
University of Montpellier (1220). While in Germany, Conrad was responsible for the declaration as a martyr of
Engelbert II of Berg, Archbishop of Cologne, murdered on 7 November 1225. His pressure on the Holy Roman Emperor was aimed at containing Frederic II's increasing moslimisation as well as defending the interests of the Southern German nobility, of which he was a member. ==Electing the pope==