Calling himself David of Trebizond, a merchant from the eastern shore of the Black Sea, Daoud appeared publicly for the first time at a council of Church leaders called by Pope Urban. He spoke from firsthand knowledge of the horrors committed by the Tartars. But Friar Mathieu d'Alcon, the Tartars' interpreter, testified that in his opinion the Tartar empire was no longer a danger to Europe. The Tartar ambassadors and their entourage were guests at the palace of Orvieto's most powerful family, the Monaldeschi. When Contessa Elvira di Monaldeschi gave a reception for the emissaries, Daoud drew them into drunken gloating over their atrocities and boasting of their plans for world conquest. Pope Urban and many other Church dignitaries were appalled listeners. With Ugolini's help, Daoud was able to persuade the influential Dominican philosopher Fra Tomasso d'Aquino to write and preach against the alliance. But then, subjected to unknown pressures, Fra Tomasso suddenly changed his position. Daoud now felt that he could do no more through intrigue. He had been in contact with the Filippeschi, an Orvieto clan who were hereditary enemies of the Monaldeschi family. And through Lorenzo he had been quietly recruiting a company of bravos--armed adventurers. Offering the help of his mercenaries, he persuaded the Filippeschi to attack the Monaldeschi palace. With de Gobignon and the Tartars' other guards diverted, he could enter the palace and kill the ambassadors. While the Filippeschi prepared for the attack, Daoud discovered that Andrea Sordello, one of his hired bravos, had been set to spy on him by Simon de Gobignon. In Tilia's brothel, Daoud subjected Sordello to a Hashishiyya initiation, using drugs and women to make the spy his slave. He implanted in Sordello's mind a command that if he should see a silver locket that Daoud keeps on his person, he would immediately kill Simon de Gobignon. And henceforth Sordello was to give Simon only the information Daoud wanted him to have. After the initiation Daoud was troubled. He had been taught how to do this, but had never done it before. Had he truly and completely subjugated Sordello's soul? On the night of the attack he was dismayed to discover the Monaldeschi ready for a siege. But, garbed in black as a Hashishiyya fighter, Daoud went ahead and slipped into the Monaldeschi palace. The Tartars, with Simon de Gobignon, Friar Mathieu, and four guards, were in the most secure room in the palace, the cellar pantry, where costly spices from the East were kept behind a thick door with a strong lock.