Providence, however, which under the name of chance or accident so frequently befriends the perplexed, now came to their aid. Not long after the unsuccessful application of Nicolo, ambassadors arrived at the court of the Great Khan, from Argûn, Sultan of Persia, demanding a princess of the imperial blood for their master, whose late queen on her deathbed had requested him to choose a wife from among her relations in Cathay. Kublai consented; and the ambassadors departed with a youthful princess on their way to Persia. When they had proceeded eight months through the wilds of Tartary, their course was stopped by bloody wars; and they were constrained to return with the princess to the court of the khan. Here they heard of Marco, who had likewise just returned from an expedition into India by sea, describing the facility which navigation afforded of maintaining an intercourse between that country and China. The ambassadors now procured an interview with the Venetians, who consented, if the permission of the khan could be obtained, to conduct them by sea to the dominions of their sovereign. With great reluctance the khan at length yielded to their solicitation; and having commanded Nicolo, Maffio, and Marco into his presence, and lavished upon them every possible token of his affection and esteem, constituting them his ambassadors to the pope and the other princes of Europe, he caused a tablet of gold to be delivered to them, upon which were engraven his commands that they should be allowed free and secure passage through all his dominions; that all their expenses, as well as those of their attendants, should be defrayed; and that they should be provided with guides and escorts wherever these might be necessary. He then exacted from them a promise that when they should have passed some time in Christendom among their friends, they would return to him, and affectionately dismissed them.