He was a son of Ridoredh of Vannes, a prominent and wealthy aristocrat first associated with the court of Erispoe in the 850s.
He owned vast landed estates and salt works (as at Guérande) in southeastern Brittany and was a patron of Redon Abbey.
[2] Pascweten was a son-in-law of Salomon, Duke of Brittany, in August 867, when he negotiated a lasting peace at Compiègne with Charles the Bald on behalf of his father-in-law and prevented the king from marching on Brittany.
They divided the country between them, though Regino of Prüm records that the latter received a larger share.
By mid 876 both were dead and Pascweten's brother, Alan the Great, had succeeded him in Vannes and carried on the fight against Judicael of Cornouaille.