Pedigree of the Ua Brolchains (Left to Right) -
Neill 'of the Nine Hostages'		Eoghain (Cenel Eoghainn)		Muiredaigh		Feradaigh (Cenel Feradaigh)
Fiachna		Suibhne mend King of Ireland d. 623		Crunmhaeil Chief of Cenel Eoghainn 650		Maili Tuile
Flann find Chief of Cenel Eoghainn d. 698		Diochon		Elgine		Brolchain (O Brolchainn)
Doiligein 1053 Royal priest of Armagh		Mael patraicc		Duibh insi		Maoil Brigdhe Mac an t-Saoir Ua Brolchain Bishop of Kildare d. 1097
Diermada | Aedha | Muiregein | Maoil Iosa an cleiricc O Brolchain d. 1086
Ballybrollaghan
There is a Ballybrollaghan in Donegal, Banagh Barony, Parish of Inver. Bally means "homeland," so this is a reference to the "homeland of the O Brolchains." All of the MacAteers except one in the 1665 Hearth Money Rolls were to be found in Banagh Barony (Barrony of Boylagh & Banagh), where they also appear in the Census of 1659. The surname O Brolchain is anglicised in various ways, O Brollaghan, O Brillaghan, etc. This can only be a reference to the O Brolchains of Donegal, of whom Mael Brighte mac an t-saoir Ua Brolchain was an ancestor. MacLysaght (Irish Families map) places their homeland further north, just south of Derry and the Inishowen Peninsula; so this may have been their original homeland (Ballybrollaghan).
Census of 1659 - Donegal Inishowen Barony
Principal Irish Names
O Barr (7), O Brillaghan (23), O Boyle (8), O Cally (22), McCallin (15), O Callane & O Cullane (12,27), O Conagill (9), O Carran (16), O Currin (3, 19), O Carny (10), McCollgan (30), McConway (6), O Callaghan (8), O Doghertye (203), O Doy (6), O Deuer (8), McDevet (27), O Donell (20), O Dermond (35), O Deveny (9), O Farran (14), McGlaghlin (76), O Granny (6), McGillneske (8), O Gollogher (12), O Herrall (8), O Hegerty (23), O Harkan (21), O Knawsie (9), O Kelly (11), McKay (6), O Lunshaghan (22), McLaughlin (63), O Luog (9), O Mrisane (7), O Moran (6), O Mulloy (7), McMurray (8), O Muncy (8), Porter (11), O Quigley (25), O Rodan (13), O Sheale (8), O Towlan (14), McVagh (6).