The Nāṣirī Generations 1: TABAKAT XI. · History of the Ghaznivide Sovereigns.

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Imam Abu-l Fazl al Hasan Baihaki relates in the Tarikh-i Nasiri, that Sultan Sa'id Mahmud heard from his father, Amir Subuktigin, that his (Subuktigin's) father was called Kara-bahkam. His name was Jauk (troop), and in Turki they call a troop bahkam; so that the meaning of the name Kara-bahkam is "black troop." Whenever the Turks in Turkistan heard his name they fled before him on account of his activity and courage.
Imam Muhammad 'Ali Abu-l Kasim Hamadi says in his Tarikh-i Majdul, that Amir Subuktigin was a descendant of King Yazdajird. When this monarch was slain in a mill in the country of Merv, in the reign of the commander of the faithful 'Usman, his followers and dependants [atba' wa ashya'], came to Turkistan, and entering into intermarriages with the people of that country after two or three generations (their descendants) became Turks. Their palaces in this country are still standing. The following is a genealogical table of this race:—Amir Subuktigin, son of Jauk Kará-bahkam, who was the son of Kará Arslán, the son of Kará-malat, son of Kará Nu'mán, son of Fíroz, son of Yazdajird, who was the sovereign of Persia,—but God knows the truth.