Firishta's History (Gulshan-i Ibrāhīmī) 43: ABOO BUKR TOGHLUK.

43

Aboo Bukr, the son of the Prince Zuffur Khan, the third son of Feroze Toghluk, is raised to the throne. — The Ameer Judeeda, or Moghul officers, refuse to acknowledge Aboo Bukr; they rise on his minister, and slay him, and invite the exiled Prince, Mahomed Khan, to urge his pretensions to the throne. — Mahomed arrives — defeats the King, and gains the throne a second time.
The conspirators having assassinated the King, raised Aboo Bukr, the grandson of the late Feroze (third son of the Prince Zuffur Khan), to the throne. Mullik Rookn-ood-Deen was appointed vizier, and took the reins of government into his own hands; but his ambition prompted him to attempt to cut off the new King, and to usurp the throne. Aboo Bukr, having timely information of his intentions, ordered him and many of the household troops, who were concerned in the conspiracy, to be put to death.
Meanwhile, the Ameer Judeeda of Samana assassinated their leader, Mullik Sooltan, the firm friend of the King, and sent his head to the Prince Mahomed at Nagrakote, whom they earnestly solicited to come and assert his rights. The Prince Mahomed, accordingly, having collected forces, advanced by the route of Jalundur to Samana, proclaimed himself king, and proceeded with an army towards Dehly. After some repulses, he in the end proved victorious; and made Aboo Bukr prisoner, on the 20th of Zeehuj, in the year 792, after a reign of one year and six months.