World of HYDE
Discovering our Ancestors and their descendants to all parts of the world. Last updated 15th March 2026.
Family: 6th Earl of Mar Domhnall Mac Uillem, 6th Earl Of Mar / Elen Ferch Llywelyn (F6803)
m. Aft 1266
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Male
6th Earl of Mar Domhnall Mac Uillem, 6th Earl Of Mar
Birth Abt 1243 Castle Kildrummy, Kildrummy, Aberdeenshire, Scotland 
Death 25 Jul 1297 Kildrummy Castle, Aberdeenshire, Scotland Burial Jul 1297 Holm Abbey, Holm Cultram, Cumberland, England Marriage Aft 1266 Father Uilleamn De Mar, 6th Earl Of Mar | F47079 Group Sheet Mother Elisabeth Comyn | F47079 Group Sheet
Female
Elen Ferch Llywelyn
Birth 1230 Cantref, Breconshire, Wales Death 16 Feb 1295 Shere, Surrey, England Burial 1295 Holme Abbey, Holme Cultram, Cumberland, England Father King of Gwynedd and Prince of Wales under King John I and King Henry III of England King Llewelyn Ap Iorwerth, Of Wales | F9666 Group Sheet Mother Princess Joan Lackland Plantagenet | F9666 Group Sheet
Female
Marjorie De Mar, Countess Of Lennox
Birth Mar 1270 Kildrummy Castle, Aberdeenshire, Scotland Death 24 Jul 1326 Golspie, Sutherland, Scotland Burial Spouse Sir John De Strathbogie, 9th Earl Of Atholl | F6818 Marriage Abt 1288 Scotland Spouse Kenneth De Moravia, 4th Earl Of Sutherland | F6819 Marriage 1304 Scotland, United Kingdom
Male
Gartnait MacDomhnaill, 7th Earl Of Mar
Birth 1272 Kildrummy, Aberdeenshire, Scotland Death Sep 1305 Mar Castle, (Present Aberdeenshire), Scotland Burial 1305 Scotland Spouse Lady Christian De Brus, Lady Of Carrick | F6817 Marriage 1295
Male
Duncan De Mar
Birth 1274 Of Kildrummy Cas, Kildrummy, Aberdeenshire, Scotland Death Yes, date unknown Burial Spouse Christina MacRuairi | F6816 Marriage
Male
Alexander De Mar
Birth Abt 1276 Of Kildrummy Castle, Kildrummy, Aberdeen, Scotland Death Yes, date unknown Burial
Female
Queen Isabel De Mar, Of Scotland
Birth 1277 Marr, Aberdeenshire, Scotland Christening 1278 Kildrummy, Aberdeenshire, Scotland Death 12 Dec 1296 Dumbarton, Dunbartonshire, Scotland(Possibly Complications Resulting From Childbirth. ) Burial 12 Dec 1296 Paisley Abbey, Paisley, Renfrewshire, Scotland Spouse King Robert De Brus, 1 Of Scotland | F27717 Marriage 25 Aug 1296 Dunnoar, Kincardine, Scotland
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Notes - Elen ferch Llywelyn the younger had an older sister of the same name 'Elen ferch Llywelyn the Elder' who was born c.1206 and died 1253 and who married John Earl of Huntington, and secondly Robert de Quincy.