From the seventh century until the Karakhanid period, the Yagma were recorded in Arabic, Persian, and Chinese accounts as a prominent and powerful political entity in the Tarim Basin, Dzungaria, and Jeti-su.
"[2] According to the Persian work Mujmal al-Tawarikh wa-'l-Qisas, the Yağma "padšâh" bore the title of Bogra Khan.
Al Gardezi, who used sources composed in the eighth century, wrote that the Yagma united numerous tribes between the Uyghurs and Karluks in the larger part of the eastern Tian Shan, including Kashgar City and District.
According to Yury Zuev, a semantic meaning of the word yağma in the ancient Common Turkic language, is "attack, onslaught.
"[6] However, according to Peter Golden, the word may have derived from Turkic verbal root yağ- "to pour down, rain",[3] but noting that the form with -ma is unusual.