Tegin Shah

Shahi Tegin, Tegin Shah or Sri Shahi was a king of the Turk Shahis, a dynasty of Western Turk or mixed Western Turk-Hephthalite origin who ruled from Kabul and Kapisa to Gandhara in the 7th to 9th centuries.

Context

was the heartland of the Turk Shahi domain, which at times included Zabulistan and Gandhara.
During their rule, the Turk Shahi were in constant conflict against the eastward expansion of the Umayyad Caliphate. About 650 CE, the Arabs captured Sistan, and started to attack Shahi territory from the west. They captured Kabul in 665 CE, but the Turk Shahis were able to mount a counter-offensive and repulsed the Arabs, taking back the areas of Kabul and Zabulistan, as well as the region of Arachosia as far as Kandahar.

Rule

In 680 CE, Shahi Tegin succeeded Barha Tegin. The Arabs again failed to capture Kabul and Zabulistan in 697–698 CE, and their general Yazid ibn Ziyad was killed in the action.
In 719/20 CE, the Tegin of Kabulistan and the Iltäbär of Zabulistan sent a combined embassy to the Chinese emperor of the Tang dynasty in Xi'an to obtain confirmation of their thrones. The Chinese emperor signed an investiture decree, which was returned to the Turk rulers:
The word "Geluodazhi" in this extract, is thought to be a transliteration of the ethnonym Khalaj. Hence Tegin Shah was "Tegin of the Khalaj". This title also appears on his coinage in Gupta script, where he is named "hitivira kharalāča", probably meaning "Iltäbär of the Khalaj". In 720 CE, the ruler of Zabulistan also received the title Gedaluozhi Xielifa, Xielifa being the known Chinese transcription of the Turkish "Iltäbär", hence "Iltäbär of the Khalaj". Overall, it seems that the Turk Shahi rulers were Khalaj Turks.
Tegin Shah abdicated in 739 CE in favour of his son Fromo Kesaro and sent an embassy through Central Asia in 719 CE: