The grant of the wool tax enabled Edward in fact to deal with the great difficulty of his realm. The troubles of the Barons' war, the need which Earl Simon felt of Llewelyn's alliance to hold in check the Marcher Barons, had all but shaken off from Wales the last traces of dependence. Even at the close of the war the threat of an attack from the now united kingdom only forced Llewelyn to submission on a practical acknowledgement of his sovereignty. Although the title which Llewelyn ap Jorwerth claimed of Prince of North Wales was recognized by the English court in the earlier days of Henry the Third, it was withdrawn after 1229 and its claimant known only as Prince of Aberffraw. But the loftier title of Prince of Wales which Llewelyn ap Gruffydd assumed in 1256 was formally conceded to him in 1267, and his right to receive homage from the other nobles of his principality was formally sanctioned. Near however as he seemed to the final realization of his aims, Llewelyn was still a vassal of the English Crown, and the accession of Edward to the throne was at once followed by the demand of homage. But the summons was fruitless; and the next two years were wasted in as fruitless negotiation. The kingdom, however, was now well in hand. The royal treasury was filled again, and in 1277 Edward marched on North Wales. The fabric of Welsh greatness fell at a single blow. The chieftains who had so lately sworn fealty to Llewelyn in the southern and central parts of the country deserted him to join his English enemies in their attack; an English fleet reduced Anglesea; and the Prince was cooped up in his mountain fastnesses and forced to throw himself on Edward's mercy. With characteristic moderation the conqueror contented himself with adding to the English dominions the coast-district as far as Conway and with providing that the title of Prince of Wales should cease at Llewelyn's death. A heavy fine which he had incurred by his refusal to do homage was remitted; and Eleanor, a daughter of Earl Simon of Montfort whom he had sought as his wife but who had been arrested on her way to him, was wedded to the Prince at Edward's court. [Sidenote: Judicial Reforms] For four years all was quiet across the Welsh Marches, and Edward was able again to turn his attention to the work of internal reconstruction. It is probably to this time, certainly to the earlier years of his reign, that we may attribute his modification of our judicial system. The King's Court was divided into three distinct tribunals, the Court of Exchequer which took cognizance of all causes in which the royal revenue was concerned; the Court of Common Pleas for suits between private persons; and the King's Bench, which had jurisdiction in all matters that affected the sovereign as well as in "pleas of the crown" or criminal causes expressly reserved for his decision. Each court was now provided with a distinct staff of judges.