Tardu

The regnal name in Turkic was Tarduš (Old Turkic: 𐱃𐰺𐰑𐰆𐱁),^[2] Medieval Greek: Ταρδου, 達頭可汗/达头可汗, Pinyin: dátóu kěhàn, Wade–Giles: ta-t'ou k'o-han, personal name: 阿史那玷厥, āshǐnà diànjué, a-shih-na tien-chüeh). According to Lev Gumilev his personal name was Kara-Churin-Turk (Кара Чурин Тюрк).^[3][4] However, when he subjugated the eastern half after the death of Tulan Qaghan, he assumed the regnal name Bilge (Wise) Khagan.

The Turkic Khaganate was a vast khaganate (empire); from Manchuria and the Great Wall of China to the Black Sea.^[5] It was impossible to govern the whole khaganate from a certain capital. So while the eastern part was directly ruled by the khagan (emperor), the western part was governed by the yabghu (vassal) on behalf of the khagan. The capital of the west was Ordukent (Suyab) (present-day Kyrgyzstan). Istemi, who was the khagan's brother, was the first and Tardu (İstemi's son) was the second yabgu.

Tardu became the yabgu in c. 575. That year, he met the Byzantine ambassador Valentinius. Being a very ambitious yabgu, he was planning to seize power in the entire khaganate. He saw his chance in 581 when khagan Taspar died. Taspar had announced his preference for Talopien (son of Muqan Qaghan) instead of his son Anluo. But Göktürk kurultai (council of tribal leaders), which was authorized to appoint the new khagan, refused to follow the former khagan's will and appointed the former khagan's son, who in turn acknowledged Ishbara Qaghan as the new khagan.^[4] This gave Tardu the necessary cause to interfere. He sent an army to back Talopien. Ishbara applied to Sui China for protection and both sides were played off each other by China.

While the east part of the khaganate suffered from civil war, Tardu was waiting for a suitable moment to realize his plans. After the Battle of the Blarathon in 591 in Sassanid Persia, Bahram Chobin who was a short-term Sasanid emperor, sought asylum in Western Turks.^[6]

In 599 Tardu declared himself to be khagan of the united khaganate (east and west)^[7] But his new status was not recognised widely. Probably to persuade the kurultai, he began a campaign against China. But unlike the Turks of the eastern part, his target of the campaign was too far away and his army suffered intensely from the poisoned water wells during the long expedition through the steppe. Finally, he had to retreat without serious combat, but this defeat was disastrous for him. After a rebellion of his subjects, he disappeared (was likely killed) in 603 or 604.

He was succeeded in the west by Niri Qaghan, a son of Talopien.

He was father to Tulu (都六) and Külüg Sibir. Sheguy and Tong Yabghu were his grandsons through Tulu.