Angelus de Clavasio (Angelo Carletti di Chivasso, c. 1411–1495) was an Italian Observant Franciscan friar, moral theologian, and papal legate. Born at Chivasso in Piedmont, he studied at Bologna, earning doctorates in canon and civil law and in theology, before entering the Observant Franciscans, among whom he repeatedly served as vicar general. He was best known for his Summa angelica de casibus conscientiae, an alphabetically arranged confessor's manual that became one of the most widely printed handbooks of moral and canonical casuistry of the late fifteenth century — so prominent that Luther consigned it to the flames alongside the canon law in 1520. He was beatified in 1753.
