Perhaps the apparent change in the dispositions of the emperors may be ascribed to the embassy which was received from the conquerors of the Avars. 35 The immense distance which eluded their arms could not extinguish their resentment: the Turkish ambassadors pursued the footsteps of the vanquished to the Jaik, the Volga, Mount Caucasus, the Euxine and Constantinople, and at length appeared before the successor of Constantine, to request that he would not espouse the cause of rebels and fugitives. Even commerce had some share in this remarkable negotiation: and the Sogdoites, who were now the tributaries of the Turks, embraced the fair occasion of opening, by the north of the Caspian, a new road for the importation of Chinese silk into the Roman empire. The Persian, who preferred the navigation of Ceylon, had stopped the caravans of Bochara and Samarcand: their silk was contemptuously burnt: some Turkish ambassadors died in Persia, with a suspicion of poison; and the great khan permitted his faithful vassal Maniach, the prince of the Sogdoites, to propose, at the Byzantine court, a treaty of alliance against their common enemies. Their splendid apparel and rich presents, the fruit of Oriental luxury, distinguished Maniach and his colleagues from the rude savages of the North: their letters, in the Scythian character and language, announced a people who had attained the rudiments of science: 36 they enumerated the conquests, they offered the friendship and military aid of the Turks; and their sincerity was attested by direful imprecations (if they were guilty of falsehood) against their own head, and the head of Disabul their master. The Greek prince entertained with hospitable regard the ambassadors of a remote and powerful monarch: the sight of silk-worms and looms disappointed the hopes of the Sogdoites; the emperor renounced, or seemed to renounce, the fugitive Avars, but he accepted the alliance of the Turks; and the ratification of the treaty was carried by a Roman minister to the foot of Mount Altai. Under the successors of Justinian, the friendship of the two nations was cultivated by frequent and cordial intercourse; the most favored vassals were permitted to imitate the example of the great khan, and one hundred and six Turks, who, on various occasions, had visited Constantinople, departed at the same time for their native country. The duration and length of the journey from the Byzantine court to Mount Altai are not specified: it might have been difficult to mark a road through the nameless deserts, the mountains, rivers, and morasses of Tartary; but a curious account has been preserved of the reception of the Roman ambassadors at the royal camp.