Gwilym was born in 1302, the son of Madog ap Hywel Vychan and Everydd verch Lewis Rosser. The place is not known.
His wife is not known. They were married, but the date and place have not been found. Their only known child was Nest verch Gwilym Sais (c1330-1388).
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Gwilym Sais ap Madog |
Madog ap Hywel Vychan |
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Everydd verch Lewis Rosser |
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| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Birth | 1302 |
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