Among other things, he was tasked by Pope Urban IV in 1263 by the papal bull Exultavit cor nostrum to investigate the legitimacy of an alleged ambassador with the Mongol Empire, John the Hungarian.
He is sometimes called William I to distinguish him from Bishop William II of Tyre and William of Agen, second patriarch of that name.
William Shakespeare | William Laud | William Blake | William | William III of England | William Morris | William McKinley | William Howard Taft | William Ewart Gladstone | William the Conqueror | William S. Burroughs | William Shatner | William Faulkner | William Randolph Hearst | William Wordsworth | William Tecumseh Sherman | William Hogarth | Prince William, Duke of Cambridge | William Penn | William Jennings Bryan | William Gibson | William Wilberforce | William James | William Makepeace Thackeray | Fort William | Agen | William Hanna | William Hague | William III | William Hurt |