Family: Earl Donald De Mar / Princess Helen Verch Llewelyn Of Wales (F30343)
m. Abt 1269
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 | Sir William De Mar (1222-1281)
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 | Elizabeth Comyn (1223-1267)
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| Prince Llewelyn Ap Iorwerth Of Wales (1173-1240)
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| Unknown Mistress (1210- ) |
| Earl Donald De Mar (1243-1297)
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| Isabel (Matilda) De Mar (1278-1302)  |
| Gratney Earl Of De Mar (1272-1305) |