Gwynhafar verch Clemen

It is known that Cathwulf married a Dumnonian princess Gwynhafar, almost certainly a daughter of Clemen ap Bledric, as part of a (temporary, at least) alliance - probably the one mentioned above by Geoffrey of Monmouth, or maybe an earlier one. The marriage was perhaps unsuccessful, as he is believed to only have had one son, Ceolwald of Wessex.