Part of the court clique supported him, and only by the intervention of P'u-ku Huai-en, who was related to Tengri by marriage, was his plan frustrated. Naturally there were countless intrigues against P'u-ku Huai-en. He entered into alliance with the Tibetan T'u-fan, and in this way the union of Turks and Tibetans, always feared by the Chinese, had come into existence.
The power of the western Turks remained a lasting menace to China, especially if they should succeed in co-operating with the Tibetans. After the annihilation of the T'u-yü-hun by the Sui at the very beginning of the seventh century, a new political unit had formed in northern Tibet, the T'u-fan, who also seem to have had an upper class of Turks and Mongols and a Tibetan lower class.