​Adeodatus (672–676), Saint, Pope, a monk of the Roman cloister of St. Erasmus on the Cœlian Hill. He was active in the perfection of monastic discipline and in the repression of the Monothelite heresy. Little else is known of him. Of his correspondence only the letters for the Abbeys of St. Peter of Canterbury and St. Martin of Tours have been preserved. He is sometimes called Adeodatus II, his predecessor, Deusdedit, being occasionally known as Adeodatus I.