In 1327, the baskak Shevkal, cousin of Öz Beg, arrived in Tver from the Horde, with a large retinue. They took up residence at Aleksander's palace. Rumors spread that Shevkal wanted to occupy the throne for himself and introduce Islam to the city. When, on 15 August 1327, the Mongols tried to take a horse from a deacon named Dyudko, he cried for help and a mob killed the Mongols. Shevkal and his remaining guards were burnt alive. The incident in Tver caused Öz Beg to begin backing Moscow as the leading Rus' state. Ivan I Kalita was granted the title of grand prince and given the right to collect taxes from other Rus' potentates. Öz Beg also sent Ivan at the head of an army of 50,000 soldiers to punish Tver. Aleksander was shown mercy in 1335, however, when Moscow requested that he and his son Feoder be quartered in Sarai by orders of the Khan on October 29, 1339.