Siôn ap Madog ap Robert Pilstwn, Hafod-y-wern, Bers, Maelor

Ffurfiau: Siôn, Pilstwn, Siôn, Pilstwn, Siôn Amhadog, Siôn
Cyfeiriadau: 72.2, 72.23, 72.29, 72.31, 72.54, 72.56, 72.6, 72.67

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