Cynddylan (Modern Welsh pronunciation: /kən'ðəlan/), or Cynddylan ap Cyndrwyn was a seventh-century Prince of Powys associated with Pengwern. Cynddylan is attested only in literary sources: unlike many kings from Brittonic post-Roman Britain, he does not appear in the early Welsh genealogies or other historical sources.[1] The son of King Cyndrwyn, Cynddylan is described in the probably seventh-century poem Marwnad Cynddylan (Elegy for Cynddylan) and seems to have been a chieftain in Powys.