There was brave feasting in the Castle of York , to which Prince John had invited those nobles, prelates, and leaders, by whose assistance he hoped to carry through his ambitious projects upon his brother’s throne. Waldemar Fitzurse, his able and politic agent, was at secret work among them, tempering all to that pitch of courage which was necessary in making an open declaration of their purpose. But their enterprise was delayed by the absence of more than one main limb of the confederacy. The stubborn and daring, though brutal courage of Front-de-Boeuf; the buoyant spirits and bold bearing of De Bracy; the sagacity, martial experience, and renowned valour of Brian de Bois-Guilbert, were important to the success of their conspiracy; and, while cursing in secret their unnecessary and unmeaning absence, neither John nor his adviser dared to proceed without them. Isaac the Jew also seemed to have vanished, and with him the hope of certain sums of money, making up the subsidy for which Prince John had contracted with that Israelite and his brethren. This deficiency was likely to prove perilous in an emergency so critical.