The cultural influence of Buddhism found expression in new and improved translations of countless texts, and in the passage of pilgrims along the caravan routes, helped by the merchants, as far as western Asia and India, like the famous Hsüan-tsang. Translations were made not only from Indian or other languages into Chinese, but also, for instance, from Chinese into the Uighur and other Turkish tongues, and into Tibetan, Korean, and Japanese. The attitude of the Turks can only be understood when we realize that the background of events during the time of empress Wu was formed by the activities of groups of the eastern Chinese gentry. The northern Turks, who since 630 had been under Chinese overlordship, had fought many wars of liberation against the Chinese; and through the conquest of neighbouring Turks they had gradually become once more, in the decade-and-a-half after the death of Kao Tsung, a great Turkish realm. In 698 the Turkish khan, at the height of his power, demanded a Chinese prince for his daughter--not, as had been usual in the past, a princess for his son. His intention, no doubt, was to conquer China with the prince's aid, to remove the empress Wu, and to restore the T'ang dynasty--but under Turkish overlordship! Thus, when the empress Wu sent a member of her own family, the khan rejected him and demanded the restoration of the deposed T'ang emperor. To enforce this demand, he embarked on a great campaign against China. In this the Turks must have been able to rely on the support of a strong group inside China, for before the Turkish attack became dangerous the empress Wu recalled the deposed emperor, at first as "heir to the throne"; thus she yielded to the khan's principal demand. In spite of this, the Turkish attacks did not cease. After a series of imbroglios within the country in which a group under the leadership of the powerful Ts'ui gentry family had liquidated the supporters of the empress Wu shortly before her death, a T'ang prince finally succeeded in killing empress Wei and her clique. At first, his father ascended the throne, but was soon persuaded to abdicate in favour of his son, now called emperor Hsüang Tsung (713-755), just as the first ruler of the T'ang dynasty had done. The practice of abdicating--in contradiction with the Chinese concept of the ruler as son of Heaven and the duties of a son towards his father--seems to have impressed Japan where similar steps later became quite common. With Hsüan Tsung there began now a period of forty-five years, which the Chinese describe as the second blossoming of T'ang culture, a period that became famous especially for its painting and literature. 5 _Second blossoming of T'ang culture_