Erispoe ( Herispogius, or Respogius; died 2 or 12 November 857) was Duke of Brittany from 851. After the death of his father Nominoe, he led a successful military campaign against the Franks, culminating in his victory at the Battle of Jengland. He's subsequently referred to as "King of Brittany", but this indicates only that he received a gift of regalia and not that he was ever king by imperial grant or even in his own charters. Erispoe's recorded titles include provinciæ Brittaniæ p… (More on Erispoe)