Ystryth Ap Marchwystl Ap Marchweithian 
Ystryth was born in Berain, Llannefydd, denbigh, Wales. Ystryth's father was Marchwystl Ap Marchweithian. His paternal grandfather was Marchweithian, Lord Of Is Aled. He was an only child. Ystryth is no longer alive.
He had a biological son named Tangno.
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Children
Tangno Ap Ystryth Ap Marchwystl Ap Marchweithi
Tangno was born in Berain, Llannefydd, denbigh, Wales. Tangno is no longer alive.
Source/Citation
Pedigrees of Anglesey and Caernarvonshire Families @ 223
Pedigrees of Anglesey and Caernarvonshire Families @ 223
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