 It is generally said that he died in 1258 or 1259, but this in an error, as we learn from the Brief of Urban IV, by which he was called to Rome, 21 July 1262.Little is known as to his youth and early manhood.At an early age, he was converted by the Cathars (a dualistic sect), became one of their bishops, and remained amongst them for seventeen years, as we learn from his own humble avowal ("Summa contra Waldenses", vi).