Paul the Deacon (c. 720s – 13 April in 796, 797, 798, or 799 AD), also known as Paulus Diaconus, Warnefridus, Barnefridus, or Winfridus, and sometimes suffixed Cassinensis (i.e. "of Monte Cassino"), was a Benedictine monk, scribe, and historian of the Lombards.