Tong Yabghu Qaghan (r. 618–628 or 630) was the qaghan of the Western Turkic Khaganate from 618 to 628. Tong Yabghu was the brother of Shikui Khagan (r. 611–618), the previous qaghan of the western Göktürks, and was a member of the Ashina clan; his reign is generally regarded as the zenith of the Western Turkic Khaganate. He is usually identified same as Ziebel, first Qaghan of Khazars.
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Name
His name is transcribed with Chinese character 統, which means "main silk thread > guideline, to unite, to command, to govern". Karakhanid scholar Mahmud al-Kashgari, writing in the 11th century, glossed toŋa in Middle Turkic as basically meaning tiger. Gerard Clauson argues against Kashgari and states that toŋa means "hero, outstanding warrior".
Reign
Tong Yabghu maintained close relations with the Tang dynasty of China, and may have married into the imperial family.
The Chinese Buddhist pilgrim Xuanzang visited the western Göktürk capital Suyab in modern Kyrgyzstan and left a description of the Qaghan. Scholars believe the qaghan described by Xuanzang was Tong Yabghu. Gao and La Vaissière argue that the qaghan Xuanzang met was his son Si Yabghu, rather than Tong Yabghu. Xuanzang described the qaghan as follows:
The khan wore a green satin robe; his hair, which was ten feet long, was free. A band of white silk wound round his forehead and hung down behind. The ministers of the presence, numbering two hundred in number, all wearing embroidered robes, stood on his right and left. The rest of his military retinue [was] clothed in fur, serge and fine wool, the spears and standards and bows in order, and the riders of camels and horses stretched far out of [sight].
According to the Old Book of Tang, Tong Yabghu's reign was once considered as the golden age of Western Turkic Khaganate:Tong Yehu Kaghan is a man of bravery and astuteness. He is good at art of war. Thus he controlled Tiele tribes to the north, confronted Persia to the west, connected with Kasmira (nowadays Kashmir) to the south. All countries are subjected to him. He controlled ten thousands of men with arrow and bow, establishing his power over the western region. He occupied the land of Wusun and moved his tent to Qianquan north of Tashkent. All of the princes of western region assumed the Turk office of Jielifa. Tong Yehu Kaghan also sent a Tutun to monitor them for imposition. The power of Western Turks had never reached such a state before".
Campaigns against Persia
Tong Yabghu's empire fought with the Sassanids of Iran. In the early 620's his nephew Böri Shad led a series of raids across the Caucasus Mountains into Persian territory. Many scholars have identified Tong Yabghu as the Ziebel mentioned in Byzantine sources as having (as qaghan of the Khazars) campaigned with the Emperor Heraclius in the Caucasus against the Sassanid Persian Empire in 627 and 628. However, the latest research on this topic proves that this is incorrect: if Tong indeed died in 628, Ziebel is to be identified with Sipi qaghan, Tong Yabghu's uncle, who murdered him and rose briefly to the throne. Sipi was by then pronounced Zibil and he was a small qaghan in charge of the western part of Tong Yabghu's empire, exactly as Ziebel was according to the Byzantine sources. Ziebel is described as the brother of Tong in the Byzantine sources, and as his uncle in the Chinese sources, a discrepancy which long precluded the identification. However uncle and elder brother is the same word in ancient Turkish, äçi, and the Chinese sources could not render this double meaning with their very precise system of kinship names. Prior to this some scholars, including Chavannes, Uchida, Gao and Xue Zhongzeng had argued that Tong Yabghu could not be positively identified with Ziebel (or any Khazar ruler) and may actually have died as early as 626. They pointed to discrepancies in the dates between Byzantine and Chinese sources and argued that definitively conflating Ziebel with Tong Yabghu was an exaggeration of the extant evidence.
Annexation of Hephthalite principalities
In c. 625, Tong Yabgu Khagan started subjugating the Hephthalite principalities, which included Tokharistan, Gandhara, Tarim Basin, Ferghana, and Bactria. After reaching the Indus valley, Tong Yabgu appointed Turkic rulers in place of the Hephthalite dynasties.
Governance
Tong Yabghu appointed governors or tuduns to manage the various tribes and people under his overlordship. In all likelihood Tong Yabghu's nephew Böri Shad, and son of Zibil/Ziebel was the commander of the Khazars, the westernmost of the tribes owing allegiance to the Western Göktürks; this branch of the family may have provided the khazars with their first qaghans in the mid seventh century.
Tong Yaghbu also supported the spread of Buddhism within his realm and patronised scholars from the monastery of Nalanda in India including the translator and monk, Prabhakāramitra.
Death
In c. 628 or 630 he was murdered by Külüg Sibir, his uncle and a partisan of the Dulu faction. Following the death of Tong Yabghu, the might of the Western Göktürks largely collapsed. Although the khaganate lingered for a few decades before falling to the Chinese Empire, many of the client tribes became independent and a number of successor states, including the Khazar Khaganate and Great Bulgaria, became independent.
Family
He had at least 2 sons:
Sy Yabghu Qaghan
Tardush Shad (達頭设) - Yabgu of Tokharistan