Family: Duncan de MAR, 7th Earl of Mar / Helen ferch LLYWELYN (F7949)
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 | William de MAR, 6th Earl of Mar (1215- )
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 | Elizabeth COMYN (1223-1267)
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| Dafydd ap LLYWELYN, Prince of Wales (1209-1246)
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| Isabella de BRAOSE (1238- )
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| Duncan de MAR, 7th Earl of Mar (1250-1297)
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| Helen ferch LLYWELYN (1240-95)
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| Gartnait de MAR, 8th Earl of Mar (1260-1305)  |
| Duncan de MAR (1262- ) |
| Alexander de MAR (1264- ) |
| Isabella de MAR (1277-1296) |
| Mary de MAR (1280- ) |