If a great battle is to be accounted lost or won, as it affects principles rather than reputations, then Brian lost at Clontarf. The leading ideas of his long and political life were, evidently, centralization and an hereditary monarchy. To beat back foreign invasion, to conciliate and to enlist the Irish-born Danes under his standard, were preliminary steps. For Morrogh, his first-born, and for Morrogh's descendants, he hoped to found an hereditary kinship after the type universally copied throughout Christendom.