Tardu or Tardush Yabghu was the second yabgu of the Western Turkic Khaganate (c. 575–603), and Ninth Khagan of the First Turkic Khaganate (599–603).
He was the son of Istämi.
Names
The regnal name in Turkic was Tarduš (),Kultegin’s Memorial Complex, TÜRIK BITIG Medieval Greek: , , Pinyin: , Wade-Giles: , personal name: , , ).
According to Lev Gumilev his personal name was Kara-Churin-Turk (Кара Чурин Тюрк).Bobodzhan Gafurovich Gafurov, Central Asia: Pre-historic to Pre-modern Times, Volume 1, Shipra Publications, 2005, , p. 328.Lev Nikolayrviç Gumilev: Eski Türkler (trans. D.Ahsen Batur) Selenge yayınları, İstanbul, 2002  p. 140, 550 However, when he subjugated the Eastern half after the death of Tulan Qaghan, he assumed the regnal name Bilge (Wise) Khagan.
Background
The Turkic Khaganate was a vast khaganate (empire); from Manchuria and the Great Wall of China to the Black sea.Jean Paul Roux: Türklerin Tarihi (Historie des Turcs), tr:Prof Dr Aykut Kazancıgil, Lale Arslan Özcan, Kabalcı yayınevi, İstanbul, 2007, p 101.
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 yabgu (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.
Years of civil war
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 Mukan Khagan) 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.
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.
Later years
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 Blarathon in 591 in Sassanid Persia, Bahram Chobin who was a short-term Sasanid emperor, sought asylum in Western Turks.A page about Hormozd IV
In 599 Tardu declared himself to be khagan of the united khaganate (east and west)Melek Tekin: Türk tarihi, p. 87, Milliyet yayınları, 1991 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.
Family
He was father to Tulu () and Külüg Sibir.
Sheguy and Tong Yabghu were his grandsons through Tulu.
References
