The Nāṣirī Generations 102: VIII. MALIK RUKN-UD-DIN, MAHMUD, SON OF YAMIN-UD-DIN, BAHRAM SHAH.

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Malik Rukn-ud-Din, Mahmud, was a prince harsh, sanguinary, and cruel. The author of this work saw him, during the lifetime of his father, in attendance upon that sovereign. Rukn-ud-Din was a person of middle height, ruddy, and fair; and his mother was a Rumi slave-girl. During the lifetime of his father he had been guilty of several perverse and contumacious acts; and his father, Malik Yamin-ud-Din, Bahram Shah, on two occasions, had imprisoned him on account of his misdeeds.
Sultan Muhammad, Khwarazm Shah, sent a mandate from Khwarazm to Bahram Shah, requesting him to despatch a force from Nimroz to join him. In conformity with this command, Malik Yamin-ud-Din, Bahram Shah, nominated his son, Rukn-ud-Din, Mahmud, to proceed with this army, and despatched it towards the confines of Khurasan along with the applicant for assistance, who had come from Khwarazm Shah, to the presence of that Sultan [Bahram Shah].
When he had reached the limits of Fushanj, and arrived near Hirat, Malik Rukn-ud-Din, while engaged in a drinking bout, slew the applicant in question, who was a Turk of distinction, and, out of fear for what he had done, returned towards Sistan again. Malik Yamin-ud-Din, Bahram Shah, on account of this misconduct, put him in durance, and despatched a numerous force under Amir Shams-ud-Din, together with presents of silks and fine linen, and numerous expressions of obligation, with many apologies, to the presence of Khwarazm Shah.
In that same year the calamities caused by the infidel Mughals happened, and those troops of Nimroz were ordered to the [frontier] fortress of Tirmiz. Chingiz Khan, the Accursed, advanced with his forces against it in person, and took Tirmiz; and the whole of the troops of Nimroz were martyred therein.
When Malik Rukn-ud-Din, after overcoming his brother, assumed the sovereignty over Sijistan, he began to tyrannize, and stretched out the hand of violence and oppression; upon which, at the solicitations of the inhabitants of Sistan, his brother, Amir Nusrat, returned from Khurasan, and between the brothers contention again ensued.
At this crisis an army of Mughals unexpectedly reached Sistan, and the whole were either slaughtered, exterminated, made captive, or martyred. The city of Sistan became desolate, and its inhabitants obtained martyrdom.