Arthen Ap Seisyll 
He had a biological son named Dyfnwallon Ap.
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Children
Dyfnwallon Ap Arthen
Dyfnwallon Ap was born in 0755 in Ceredigion, Wales. Dyfnwallon Ap is no longer alive.
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Arthen Ap Seisyll Dyfnwallon Ap Arthen