Paul the Deacon (c. 720s – 13 April 799 AD), also known as Paulus Diaconus, Warnefridus, Barnefridus, Winfridus and sometimes suffixed Cassinensis (i.e. "of Monte Cassino"), was a Benedictine monk, scribe, and historian of the Lombards.
An ancestor named Leupichis entered Italy in the train of Alboin and received lands at or near Forum Julii (Cividale del Friuli). During an invasion, the Avars swept off the five sons of this warrior into Pannonia, but one, his namesake, returned to Italy and restored the ruined fortunes of his house. The grandson of the younger Leupichis was Warnefrid, who by his wife Theodelinda became the father of Paul. Paulus was his monastic name; he was born Winfrid, son of Warnefrid.
Born between 720 and 735 in the Duchy of Friuli to this possibly noble Lombard family, Paul received an exceptionally good education, probably at the court of the Lombard king Ratchis in Pavia, learning from a teacher named Flavian the rudiments of Greek. It is probable that he was secretary to the Lombard king Desiderius, a successor of Ratchis; it is certain that this king's daughter Adelperga was his pupil. After Adelperga had married Arichis II, duke of Benevento, Paul at her request wrote his continuation of Eutropius.
It is certain that he lived at the court of Benevento, possibly taking refuge when Pavia was taken by Charlemagne in 774; but his residence there may be much more probably dated to several years before that event. Soon he entered a monastery on Lake Como, and before 782 he had become a resident at the great Benedictine house of Monte Cassino, where he made the acquaintance of Charlemagne. About 776 his brother Arichis had been carried as a prisoner to Francia, and when five years later the Frankish king visited Rome, Paul successfully wrote to him on behalf of the captive.