Italian Augustinian philosopher and theologian who gained recognition as an educator and author of works on logic.

Paul studied at the universities of Oxford and Padua, where he also lectured (1408–15), and became Venetian ambassador to Poland (1413), but difficulties with the Venetian authorities prompted him to sever his ties with Venice. While teaching in Bologna (1424) and Siena (1422, 1427), where he became rector, he introduced the logic of William of Ockham (Ockham, William of). His principal works include Logica parva (1473), Logica magna (1481), Summa totius philosophiae naturalis (1496), and several discussions on Aristotle. The first two selections are known as Logica duplex, and they were used as a comprehensive textbook during the 15th and 16th centuries.