On Yuan Chwang's Travels in India, 629–645 A.D. v2.c26.s1.22

v2.c26.s1.22

A north-westerly course from Lake Issik-kül brought the traveller to the place which he calls ‘the city of the Su-she water’, that is to say, the modern Tokmak on the Chu (Tchou) river, which the Chinese knew by the name of Su-she. This city was the residence of the powerful Khākān, or supreme chief, of the Western Turks, who hospitably received the pilgrim,² and appointed officers to conduct him as far as Kapiśa on the Indian frontier (Beal, Life, p. 44).