The MacDermots originate from a group of Celtic Clans who dominated Connacht in early Christian times. In the 10th century a deal was made between two brothers, whereby the younger, our ancestor Mulrooney, relinquished all claims to the Kingship of Connacht in exchange for the lands of Moylurg.
The MacDermots occupied Moylurg from then until the end of the 16th century, the exploits of their leaders being documented by monks in the Annals of Lough Key. From then on the dispersal of the Clan began, mostly as a result of the takeover of the lands by planter families, rewarded by land grants for their service to the English Crown. The diaspora reached its climax in the 19th century at the time of the Great Hunger.