Nielsen Hayden genealogy
Family: Donald of Mar / Ellen (F12455)
William of Mar ( -1281) 
|
Elizabeth Comyn ( -1267)
|
| Llewelyn Fawr ap Iorwerth (1173-1240)
|
Margaret verch Llewelyn ( -1265)  |
| Donald of Mar ( -1297)
|
| Ellen ( -1294)
|
| Isabel of Mar ( -1301) |