Bledric ap Custennin (also known as Blederic, Bredrice, Peledric, Bletius, Bledrys, Bledrig, Bletricius or Bledericus) was a 6th- and 7th-century ruler of Dumnonia (now part of the English West Country).
The actual status and reality of Bledric is difficult to ascertain as most his references are in old Welsh literature variously known as "King", "Duke" or "Prince" of Devonshire and/or Cornwall.
The fullest account of Bledric's life comes from Geoffrey of Monmouth's pseudohistorical Historia Regum Britanniae where he is numbered amongst the legendary Dukes of Cornwall.
Here Bledric, Duke of Cornwall, was the commander of the allied British armies which included King Cadvan of North Wales (Cadfan ap Iago of Gwynedd) and King Margadud of South Wales (probably Maredydd ap Rhain of Dyfed) at the Battle of Bangor-is-Coed.
[1] His sons apparently went on to 'enjoy the government of North Wales ever since Cadfan ap Iago was chief King in Britain.'