The Nāṣirī Generations 130: XII. SULTĀN RUKN-UD-DĪN, GHŪRĪ SHANASTĪ, SON OF MUHAMMAD, KHWĀRAZM SHĀH.

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Sultān Rukn-ud-Dīn was another of Sultān Muhammad’s sons, and his birth took place on the night preceding the day on which Sultān Mu’izz-ud-Dīn Muhammad-i-Sām, Ghūrī, retreated from before the gates of Khwārazm in the year 601 H.; and, on that account, he was named Ghūrī Shanastī, that is to say, “The Ghūrī Breaker.”
When the territory of ’Irāk fell under the sway of Sultān Muhammad, Khwārazm Shāh, he conferred the throne of that country upon Rukn-ud-Dīn. The daughter of Malik Ulugh Khān-i-Abī Muhammad, who was a descendant of one of the paternal uncles of the Khwarazm Shahs, was given him in marriage, and the father-in-law was made the Lieutenant of Sultan Rukn-ud-Din, by Sultan Muhammad; and the whole of the Maliks of Ghur, and the troops of the Jibal [of Khurasan], were left to serve under him. When [his father], Sultan Muhammad, retired from the territory of Irak, the Turks of ’Irak, who were slaves of the Ata-baks, assembled [their troops] together, and gave him battle, but the Khwarazm Shahis gained the victory, in the year 614 H.
Rukn-ud-Din reigned in ’Irak for a considerable period; and, when the Mughal troops reached that country, and tribulation befell the Musalmans, the whole of the Khwarazm Shahis fell into captivity, in the year 617 H., and were, in all probability, martyred.