Thomas D'Arcy McGee

By the deposition of Malachy II., and the transfer of supreme power to the long-excluded line of Heber, Brian completed the revolution which Time had wrought in the ancient Celtic constitution. He threw open the sovereignty to every great family as a prize to be won by policy or force, and no longer an inheritance to be determined by usage and law. The consequences were what might have been expected. After his death the O'Conors of the west competed with both O'Neills and O'Briens for supremacy, and a chronic civil war prepared the path for Strongbow and the Normans.