This branch of the O'Briens were descended from Sir Donnagh O'Brien of Duagh of Elizabethan times. In 1682 Donnogh O'Bryen of Dough, county Clare, was granted lands in the baronies of Corcomroe, Burren and Inchiquin, amounting to over 5,000 acres. Edward O'Brien of Ennistymon, county Clare, married Susanna daughter of Henry O'Brien of Balliclogh and had a son Christopher who had 4 sons all of whom died without heirs. Christopher's sister Anne married the Honourable Matthias Finucane and their daughter Susanna married William Macnamara of Doolin. The Ballycorick estate, 2081 acres in the barony of Island, of Christopher O'Brien the elder , Christopher O'Brien the younger, and their trustees Thomas Blair Hutheaite and Patrick David Jeffers, was offered for sale in July 1853.