(Peter Urseolus) (928–987) was the Doge of Venice from 976 until 978.
He abdicated his office and left in the middle of the night to become a monk.
He later entered the Camaldolese Order.
He is venerated as a saint in the Catholic Church following his canonization in 1731.
In 1733 the Venetian librarian, Giuseppe Bettinelli, published an edition of a biography written by the infamous heretical Friar Fulgenzio Manfredi in 1606.