Gronwy was born about 1300, the son of Iorwerth ap Dafydd and Gwenllian verch Ithel Vychan. The place is not known.
His wife was Gwenhwyfar verch Adda Goch, who he married in ABT 1336. The place has not been found. They had no known children.
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Gronwy ap Iorwerth |
Iorwerth ap Dafydd |
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Gwenllian verch Ithel Vychan |
Ithel Vychan ap Ithel Gam |
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Adles verch Richard |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1300 |
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