Ysfael Gwron, King of Ysfeilion
(Born. c.AD 430)
(Latin: Ismaglus; English: Osbald)

Ysfael was one of the many sons of Cunedda Wledig, amongst whom his kingdom was eventually divided. He inherited the only portion of Ynys Mon (Anglesey) conquered by Cunedda's family, the eastern horn around Beaumaris. The name of his kingdom was long retained in Maes Osmeliaun, now known as Llanfaes. It was a dangerous border region, for the Irish controlled the rest of the Island; but Ysfael appears to have upheld the British foothold with some success. It was suggested by Owen Rhoscomyl that he should probably be identified with Cunedda's son, Gwron - an epithet meaning 'Hero'. He only appears in late lists of Cunedda's sons, and his own sons, Meilir Meilirion, Cynyr and Yneigr, were certainly active on Ynys Mon (Anglesey).