1
I. Kok Turks destroyed the Avar Empire and established a strong state in 552 CE.
II. Kok Turks formed alliances with the Sasanids and the Byzantine Empire.
III. The Eastern Kok Turk Empire fell in 659 CE.
IV. The Western Kok Turk Empire fell in 630 CE.
Which of the events above are correct about Kok Turks?