Seisyll Ap Clydawc De Ceredigion 
He had a biological son named Arthen Ap Seisyll.
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Personal Details
Seisyll Ap Clydawc De Ceredigion
Seisyll Ap Clydawc was born in 0700. Seisyll Ap Clydawc is no longer alive.
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Children
Arthen Ap Seisyll De Ceredigion
Arthen Ap Seisyll was born in 0740. He died at the age of 67 in 0807.
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