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Emperor Gaozu of Tang allowed the assassination of a khagan of the Western Turkic Khaganate by Eastern Turkic rivals, one of the earliest events in the Tang campaigns against the Western Turks.

Historical image related to Emperor Gaozu of Tang allowed the assassination of a khagan of the Western Turkic Khaganate by Eastern Turkic rivals, one of the earliest events in the Tang campaigns against the Western Turks. from November 2, 619

Emperor Gaozu of Tang

Emperor of China from 618 to 626

Emperor Gaozu of Tang, born Li Yuan, courtesy name Shude, was the founding emperor of the Tang dynasty of China, reigning from 618 to 626 CE. Under the Sui dynasty, Li Yuan was the governor in the area of modern-day Shanxi, and was based in Taiyuan.
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Khagan

Imperial title of Mongolic and Turkic societies

Khagan or Qaghan is a title of imperial rank in Turkic, Mongolic, and some other languages, equal to the status of emperor and someone who rules a khaganate (empire). The female equivalent is Khatun.
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Western Turkic Khaganate

581–742 CE monarchical state

The Western Turkic Khaganate or Onoq Khaganate was a Turkic khaganate in Eurasia, formed as a result of the wars in the beginning of the 7th century after the split of the First Turkic Khaganate, into a western and an eastern Khaganate.
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Göktürks

Turkic people in Inner Asia

The Göktürks, also known as Türks, Celestial Turks or Blue Turks, were a Turkic people in medieval Inner Asia. The Göktürks, under the leadership of Bumin Qaghan and his sons, succeeded the Rouran Khaganate as the main power in the region and established the First Turkic…
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Tang campaigns against the Western Turks

640–712 Chinese expansion into Central Asia

The Tang campaigns against the Western Turks, known as the Western Tujue in Chinese sources, were a series of military campaigns conducted by the Tang dynasty against the Western Turkic Khaganate in the 7th century AD. Early military conflicts were a result of the Tang…
Source: Wikipedia (CC BY-SA)