The King, or Khagan, of the Khazars, by the name of Bulan, had resolved to abandon paganism, but was undecided as to the religion he should adopt instead. Messengers sent by the Caliph persuaded him to accept Islam, envoys from Byzantium endeavored to win him over to Christianity, and representatives of Judaism championed their own faith. As a result, Bulan arranged a disputation between the advocates of the three religions, to be held in his presence, but he failed to carry away any definite conviction from their arguments and mutual refutations. Thereupon the King invited first the Christian and then the Mohammedan, and questioned them separately. On asking the former which religion he thought was the better of the two, Judaism or Mohammedanism, he received the reply: Judaism, since it is the older of the two, and the basis of all religions.[7] On asking the Mohammedan, which religion he preferred, Judaism or Christianity, he received the same reply in favor of Judaism, with the same motivation. "If that be the case," Bulan argued in consequence, "if both the Mohammedan and the Christian acknowledge the superiority of Judaism to the religion of their antagonist, I too prefer to adopt the Jewish religion." Bulan accordingly embraced Judaism, and many of the Khazar nobles followed his example. According to the Jewish sources, one of Bulan's descendants, the Khagan Obadiah, was a particularly zealous adherent of Judaism. He invited--possibly from Babylonia--many Jewish sages to his country, to instruct the converted Khazars in Bible and Talmud, and he founded synagogues, and established Divine services.