Tributes were paid by India and Tonkin. The Caliphs of Medina sent precious stones, horses, and spice. From the Japanese capital, Nara, came envoys and students at frequent intervals, while once, in 643, from far Greece Emperor Theodosius despatched a mission to the court of Cathay.
It was an age of prosperity. The fertile valleys of the Yellow River and the Yangtze-kiang were turned into fields of rice, barley and waving corn, amid gleaming streams and lakes. Peace reigned in China proper—the vast domain that had once been torn up and made desolate by internecine wars during the four centuries of the Three Kingdoms and the Six Dynasties. Even in the remotest rural district, the wine-pennant, a tavern sign, was seen flying on the roadside, denoting the presence of tranquillity and good cheer, while large cities like Lo-yang (i. e. Honan-fu, Honan) and Chin-ling (i.e. Nanking, Kiansu) flourished immensely with increasing trade and travel.
Chang-an, the present city of Hsian-fu in Shensi, was the capital and the wonder of the age. The city was never so rich, splendid, and spendthrift. "See ye," proudly sings a poet, "the splendor of the imperial abode, and know the majesty of the Son of Heaven!" Beside the main castle with its nine-fold gates, there were thirty-six imperial palaces that reared over the city their resplendent towers and pillars of gold, while innumerable mansions and villas of noblemen vied with one another in magnificence. By day the broad avenues were thronged with motley crowds of townfolk, gallants on horseback, and mandarin cars drawn by yokes of black oxen. And there were countless houses of pleasure, which opened their doors by night, and
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