Dominican; born Sansedoni, near Siena, Italy, 1220; died Siena, Italy, 1286. In 1260 he went as a missionary to Hungary. When Siena twice rebelled against the Holy See, Ambrose’s eloquence obtained its pardon. He brought about a reconciliation between Conrad of Germany and Pope Clement IV, and as papal legate, restored peace between Venice and Genoa, and Florence and Pisa. Feast, 8 October.