The king lay in the Palace of San Marco, where a lodging had been prepared for him, and thither on the day after his entrance came Cesare Borgia, with six Cardinals, from the Castle of Sant’ Angelo, whither the Pope had withdrawn, to wait upon his Christian Majesty. Charles immediately revealed the full and exigent nature of his demands. He required the Pope’s aid and counsel in the conquest of Naples, upon which he was proceeding; that Cesare Borgia be delivered into his hands as a hostage to ensure the Pope’s friendliness; and that the Castle of Sant’ Angelo be handed over to him to be used as a retreat in case of need or danger. Further, he demanded that Prince Djem--the brother of Sultan Bajazet, who was in the Pope’s hands--should be delivered up to him as a further hostage. This Djem (Gem, or Zizim, as his name is variously spelled) was the second son of Mahomet II, whose throne he had disputed with his brother Bajazet on their father’s death. He had raised an army to enforce his claim, and had not lacked for partisans; but he was defeated and put to flight by his brother. For safety he had delivered himself up to the Knights of Rhodes, whom he knew to be Bajazet’s implacable enemies. They made him very welcome, for d’Aubusson, the Grand Master of Rhodes, realized that the possession of the prince’s person was a very fortunate circumstance for Christianity, since by means of such a hostage the Turk could be kept in submission. Accordingly d’Aubusson had sent him to France, and wrote: “While Djem lives, and is in our hands, Bajazet will never dare to make war upon Christians, who will thus enjoy great peace. Thus is it salutary that Djem should remain in our power.” And in France Djem had been well received and treated with every consideration due to a person of his princely rank. But he appears to have become a subject of contention among the Powers, several of which urged that he could be of greater service to Christianity in their hands than in those of France. Thus, the King of Hungary had demanded him because, being a neighbour of Bajazet’s, he was constantly in apprehension of Turkish raids. Ferdinand of Spain had desired him because the possession of him would assist the Catholic King in the expulsion of the Moors. Ferrante of Naples had craved him because he lived in perpetual terror of a Turkish invasion. In the end he had been sent to Rome, whither he went willingly under the advice of the Knights of Rhodes, whose prisoner he really considered himself. They had discovered that Bajazet was offering enormous bribes to Charles for the surrender of him, and they feared lest Charles should succumb to the temptation.