Besides many small tribes, there were in the age of Henry II. five principal sovereignties in the island, Munster, Leinster, Meath, Ulster, and Connaught; and as it had been usual for the one or the other of these to take the lead in their wars, there was commonly some prince, who seemed, for the time, to act as monarch of Ireland. Roderic O Connor, king of Connaught, was then advanced to this dignity[1]; but his government, ill obeyed even within his own territory, could not unite the people in any measures, either for the establishment of order, or for defence against foreigners. The ambition of Henry had, very early in his reign, been moved, by the prospect of these advantages, to attempt the subjecting of Ireland; and a pretence was only wanting to invade a people, who, being always confined to their own island, had never given any reason of complaint to any of their neighbours. For this purpose, he had recourse to Rome, which assumed a right to dispose of kingdoms and empires; and not foreseeing the dangerous disputes, which he was one day to maintain with that see, he helped, for present, or rather for an imaginary, convenience, to give sanction to claims which were now become dangerous to all sovereigns. Adrian IV. who then filled the papal chair, was by birth an Englishman; and being, on that account, the more disposed to oblige Henry, he was easily persuaded to act as master of the world, and to make, without any hazard or expence, the acquisition of a great island to his spiritual jurisdiction. The Irish had, by precedent missions from the Britons, been imperfectly converted to Christianity; and, what the pope regarded as the surest mark of their imperfect conversion, they followed the doctrines of their first teachers, and had never acknowledged any subjection to the see of Rome. Adrian, therefore, in the year 1156, issued a bull in favour of Henry; in which, after premising, that this prince had ever shown an anxious care to enlarge the church of God on earth, and to encrease the number of his saints and elect in heaven; he represents his design of subduing Ireland as derived from the same pious motives: He considers his care of previously applying for the apostolic sanction as a sure earnest of success and victory; and having established it as a point incontestible, that all Christian kingdoms belong to the patrimony of St. Peter, he acknowledges it to be his own duty to sow among them the seeds of the gospel, which might in the last day fructify to their eternal salvation: He exhorts the king to invade Ireland, in order to extirpate the vice and wickedness of the natives, and oblige them to pay yearly, from every house, a penny to the see of Rome: He gives him entire right and authority over the island, commands all the inhabitants to obey him as their sovereign, and invests with full power all such godly instruments as he should think proper to employ in an enterprize, thus calculated for the glory of God and the salvation of the souls of men[2]. Henry, though armed with this authority, did not immediately put his design in execution; but being detained by more interesting business on the continent, waited for a favourable opportunity of invading Ireland.