Zemarchus and Maniach to the Muhan Khan arrived in Taraz at the court of Istemi Yabgu. The Persian ambassador also appeared at the court of the Turkic Kagan at the same time, but Istemi Yabgu allied with Byzantium.
Unfortunately, it is not illustrated in the written sources of that time what Taraz looked like but it is said to have been a big city. The Chinese pilgrim Xuanzang, who passed through Taraz in 630, came to the Ta-lo-se having travelled 8 or 9 li. (according to the Chinese measures this equals 576m) in this city alternately. Due to written sources and archaeological investigation it is known from the 1st BC to 5th AD Kangui (Kanglu) tribes lived in the Talas River Valley. Similarity between the excavated materials of Taraz and the Kurgans of the Gynskyi and Usunskyi-Kanguiskyi tribes show the introduction of Turkic language. Mongolian features and elements appear in the settled culture of local mainly European population. According to A. N. Bernshtam's statement it was a period of ethnogenesis for Central Asia's modern Turkic populations Taraz was joined to the Western Turk Khanate. It felt, like other cities of the region, the influence of Sogdian culture.
The evidence suggests that in Taraz, as other cities in Southern Kazakhstan, Turks were the major ethnic element of the population in 4th-13th centuries, together with Sarts, Arabs and Persians. Written sources of Paleo-Anthropological material collected from Kurgans in Southern Kazakhstan show the existence of close ties between Taraz and the Kypchaks, Qarluq populations of nearby valleys. As a result of an internecine struggle amongst Turkish tribal leaders at the beginning of 8th century the Turkish tribe in the Ili River Valley was divided into two branches: Yellow and Black. The Black(Kara) Turkish owned the Talas River Valley and made Taraz their capital in the middle of 7th century. In 751 in the Talas River region, upstream from the modern city of Taraz, an army comprising Yang
