Meddyf married Cadwallon I "Llaw Hir" (the Long-Handed) AB EINION, King of Gwynedd, son of Einion "Yrth" AP CUNEDDA, King of Gwynedd, and Prawst FERCH DEITHLYN of the Picts, before 480. (Cadwallon I "Llaw Hir" (the Long-Handed) AB EINION was born about 460 and died in 534.)