This extraordinary Gaelic family dominated the history of Rathdown through the centuries. Chris Smal’s thorough investigation of the Mac Gilla Mo-Cholmoc family-tree leaves us in no doubt about this vital role, and the skills involved in surviving turbulent times alongside Norse and Norman visitors and attacks from neighbouring Gaelic clans. Following the Norman invasion, in a period of just over one hundred years, the proud, ancient, Gaelic Mac Gilla Mo-Cholmoc clan would become anglicised and accepted into the Norman fold as the Mac Dermot / Fitzdermot family.
While other Gaelic clans were dispossessed and banished to the wilds, the astute pragmatism of the Mac Gilla Mo-Cholmoc leaders would ensure that as lords of Rathdown they would retain their lands and entitlements….
Smal, Chris (1993) Ancient Rathdown and Saint Crispin’s Cell : A uniquely historic landscape. Friends of Historic Rathdown, Greystones.