Edward now gave full proof of his natural generosity and clemency. A treaty was signed in which Llewellyn consented to pay the king a tribute of one thousand marks a year for the Isle of Anglesea; to pay fifty thousand pounds for the cost of the war; and to give ten hostages for the fulfilment of these engagements. The very next day, Edward, who had made peace the moment the Welsh Prince desired it, remitted the fine of fifty thousand pounds and soon after gave up the tribute for Anglesea and restored the hostages. He then invited Llewellyn to spend Christmas at Westminster; and in the following summer prepared a princely wedding at Worcester for him and Eleanor de Montfort. For four years the Welsh troubles seemed at an end. All was apparently peace and content. But "a prophecy of Merlin had announced that when English money became round, the Prince of Wales should be crowned at London, and a new coinage of copper money, coupled with the prohibition to break the silver penny into halves and quarters, as had been usual, was supposed to have fulfilled the prediction."[17] Upon such slight matters do the fate of nations hang. The hopes of the misguided Welsh were again excited; and in 1282, Llewellyn's brother David--who had been heaped with favors by Edward, given an English earldom, and married to the Earl of Derby's daughter--suddenly broke into open rebellion. On Palm Sunday he surprised the garrison of Hawarden Castle--now well known as the residence of Mr. Gladstone, the English Premier. He hurried Lord Roger de Clifford the governor, wounded and in chains, over the mountains, while he himself and Llewellyn, who never before agreed, were now reconciled, and together overran the marches with fire and sword. Even now Edward strove to come to terms before taking up arms. He allowed the archbishop to go to Llewellyn as a mediator. It was of no use. So in the summer of 1283 he collected his forces and once more entered Wales.