In 1275, Edward granted the whole of Thomond to Thomas de Clare, who took advantage of the dissensions among the O'Briens, and built the strong castle of Bunratty to dominate the district. The conquest of Thomond was, however, never completed, or nearly completed, nor did the De Clares succeed in establishing themselves like the De Burgos. They might have done so had they not come so late into the field, and their failure was certainly not owing to any exceptional power of combination shown by the Irish. It was rather due to quarrels among the colonists, whose strength was being constantly sapped by taking part in Edward's Scotch wars, and who were not recruited by any considerable immigration. In 1245, the male line of the Earl Marshal was finally extinguished, and the inheritance of Strongbow fell to five sisters, the great grand-daughters of Dermod MacMurrough. Matilda, the eldest, obtained Carlow and carried the hereditary office of Earl Marshal to her husband, Hugh Bigot, Earl of Norfolk. Joan, the second, received Wexford. Isabella, the third, had Kilkenny, which her descendants sold to the Ormonde family. Sibilla, the fourth, had Kildare for her share. Eva, the youngest sister, married William De Braose; and through her daughter, who was married to Roger Mortimer, became ancestress of most of the royal houses of Europe. As the five daughters of William Earl Marshal were all married, and had all children, the history of Leinster becomes very confusing. Had it remained in one strong hand the Irish would hardly have recovered their ground. But, as Giraldus points out, the 'four great pillars of the conquest, Fitz-Stephen, Hervey, Raymond, and John de Courcy, by the hidden but never unjust judgment of God, were not blessed with any legitimate offspring.' A similar fatality attended many others, including Earl Richard, to whom, and not to Fitz-Stephen, common fame, more true in this case than contemporary history, has attributed the real leadership among the Anglo-Norman invaders of Ireland. [Sidenote: Edward I. weakens the colony by drawing men and supplies from it.]