  The last period of Bonaventure’s life saw him rise to become one of the most prominent men in Christendom. During the three year Papal vacancy, from 29 November 1268 to 1 September 1271, Bonaventure preached an important sermon in Viterbo and was probably instrumental in the invention of conclave. He is said to have been offered the papacy by the electors and to have suggested Teobaldi Visconti instead.  After Teobaldi’s election as Pope Gregory X, he appointed Bonaventure cardinal on 28 May  1273,[8]  where he preached on reunification of eastern and western Churches, a major goal of the council which seemed to have been achieved when he suddenly fell ill on 15 July 1274 and “at the hour of Matins died Br. Bonaventure of happy memory, Bishop of Albano, who was a man eminent for his knowledge and eloquence (homo eminentis scientie et eloquentie), a man outstanding for his sanctity and acknowledged for the excellence of his life, both religious and moral…Br. Peter of Tarantasia [also a Cardinal] celebrated the funeral mass and preached on the theme ‘I am saddened over you, my brother Jonathan.’ There were many tears and much weeping, for the Lord had given him such grace that the hearts of all who saw him were seized with a desire for his  love.”[9]