When Henry ascended the English throne, he entertained the project of taking possession of Ireland; and, following the example of the Conqueror, he first took measures to obtain the sanction and assistance of the Pope to his enterprise. The papal chair was at that time occupied by Nicholas Breakspeare, called Adrian IV., the only Englishman who ever wore the tiara. He was a man of obscure birth, but of considerable intelligence, who had quitted his native land at an early age, and travelled through France to Italy, where he entered an abbey as secretary. Unaided by wealth or connections, his abilities gradually raised him to the dignity of abbot, from which he rose to be bishop, and ultimately Pope. Adrian assented to the request of Henry, and issued a bull, authorising him to undertake the conquest of Ireland. The king, however, was deterred, by the advice of his counsellors, and by the urgency of other affairs, from entering upon the expedition at that time, and the papal bull was deposited in the royal treasury at Winchester, without being promulgated. [Illustration: THE SIEGE OF WATERFORD. (_See p._ 201.)] Fourteen years later, some Norman and Flemish adventurers, who had previously settled in Wales, were invited to Ireland by one of the native princes. Dervorgilla, a lady of remarkable beauty, wife of Tiernan O'Rourke, a powerful chief, was carried off by Dermot MacMurrogh, King of Leinster. Dermot, who was a man of cruel and arrogant temper, had many enemies, and he now found himself attacked on different sides by O'Rourke, and those who supported his cause. Ultimately a general combination was formed against the King of Leinster, and he was compelled to quit the country. He proceeded to ask the support of King Henry, who was then in Aquitaine. Henry, occupied at that time with other affairs of importance, received him graciously, and gave him letters, authorising the subjects of the English crown to take up arms in his favour. Furnished with these, Dermot returned to England, and, after some delay, he obtained the assistance of Richard de Clare, surnamed Strongbow, Earl of Pembroke, to whom he promised his daughter Eva in marriage. Subsequently he made arrangements with Robert Fitz-Stephen and Maurice Fitz-Gerald, to whom he agreed to give the town of Wexford, with other rewards, in return for the services they were to render him.