Meanwhile there came unexpectedly to the fore in the north a people grouped round a nucleus tribe of Huns, the tribal union of the "T'u-chüeh", that is to say the Gök Turks, who began to pursue a policy of their own under their khan. In 546 they sent a mission to the western empire, then in the making, of the Northern Chou, and created the first bonds with it, following which the Northern Chou became allies of the Turks. The eastern empire, Ch'i, accordingly made terms with the Juan-juan, but in 552 the latter suffered a crushing defeat at the hands of the Turks, their former vassals. The remains of the Juan-juan either fled to the Ch'i state or went reluctantly into the land of the Chou. Soon there was friction between the Juan-juan and the Ch'i, and in 555 the Juan-juan in that state were annihilated. In response to pressure from the Turks, the Juan-juan in the western empire of the Northern Chou were delivered up to them and killed in the same year. The Juan-juan then disappeared from the history of the Far East. They broke up into their several tribes, some of which were admitted into the Turks' tribal league. A few years later the Turks also annihilated the Ephtalites, who had been allied with the Juan-juan; this made the Turks the dominant power in Central Asia. The Ephtalites (Yeh-ta, Haytal) were a mixed group which contained elements of the old Yüeh-chih and spoke an Indo-European language. Some scholars regard them as a branch of the Tocharians of Central Asia. One menace to the northern states of China had disappeared--that of the Juan-juan. Their place was taken by a much more dangerous power, the Turks. 3 _The Northern Ch'i dynasty; the Northern Chou dynasty_ In consequence of this development the main task of the Northern Chou state consisted in the attempt to come to some settlement with its powerful Turkish neighbours, and meanwhile to gain what it could from shrewd negotiations with its other neighbours. By means of intrigues and diplomacy it intervened with some success in the struggles in South China. One of the pretenders to the throne was given protection; he was installed in the present Hankow as a quasi-feudal lord depending on Chou, and there he founded the "Later Liang dynasty" (555-587). In this way Chou had brought the bulk of South China under its control without itself making any real contribution to that result.