The Uí Dúnchada lineage took the surname Mac Gilla Mo Cholmóc by 1100.
The Uí Dúnlainge were a "powerful lineage ... which had risen to dominance in Laigin Tuadgabair, divided into three segments during the early eighth century, each of which in turn formed distinct kingdoms."
The cantred of Newcastle Lyons appears to derive from the Uí Dúnchada of 'proper', as distinct from the regional kingdom of the same name.
Grants of 1173, 1185, 1207, 1213 and 1377, make clear that it included the parishes of Ballybought, Ballymore and Tipperkevin in County Kildare; Kilbride, Blessington, Burgage, Boystown, Hollywood, Crehelp, Tober, Dunlavin, Rathsallagh and part of Donard, all in County Wicklow.
Rathdown Castle (anciently Rath Oinn) was a historical centre of Uí Dunchada power.