Family: 6th Earl of Mar Domhnall Mar, I / Countess Of Chester Helen Ferch Liewellyn of Wales (F25589)
m. Abt 1270
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 | 9th Earl of Mar Uilleam Dhonnchadha (1222-1281)
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 | Countess Of Mar Elizabeth Isabel Comyn (1223-1267)
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| Prince Of Gwynedd Daffyd Ap Llewelyn (1212-1246)
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 | Isabella De Braose (1215-1248)
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 | 6th Earl of Mar Domhnall Mar, I (1230-1297)
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| Margaret of Mar (1270-1326)  |
| 7th Earl of Mar Gratney Mar (1267-1305) |
| Isabella MacDonald (1270-1298) |
 | Queen Isabella of Mar (1280-1301) |
| Mary Mar (1289-1326) |