The Göktürk family tree refers to the ruling Ashina clan of the Turkic Khaganate, a vast medieval empire which stretched from northeast China to the Black Sea. The following family tree is given in five sections: The color legend is as follows. It can be seen that both the central empire and (later) the east wing were ruled by the descendants of Bumin and the west part was ruled by the descendants of İstemi with two exceptions; * Tardu, a yabgu of the west became the central khagan between 599-603 . * Yukuk, a shad (a prince) in the east wing became the ruler of the west wing.