Taj al-Mulk Abu'l Ghana'em Marzban ibn Khosrow Firuz Shirazi (), better simply known as Taj al-Mulk (تاج الملک) was a Seljuk Empire courtier during the reigns of Malik-Shah I and his son Berkyaruq.
Of Persian people descent, he was unofficially the vizier of Seljuk Empire for not more than 7 months.
He finally gained a chance to increase the disagreements between Nizam al-Mulk and the Sultan. Although both Nizam al-Mulk and the Sultan were in agreement about the future Sultan, Berkyaruq, Taj al-Mulk supported Mahmoud, the child of Terkan Khatun.
He was responsible to deliver Sultan Malik-Shah's harsh letter to Nizam al-Mulk, which Nizam al-Mulk answered with harsh words as well. Malik-Shah, angry of Nizam al-Mulk's harsh words, and was preparing himself for a travel to Baghdad. When they reached Nahavand, Nizam al-Mulk was assassinated by an Isma'ili agent. Primary sources explicitly mentioned that the assassination of Nizam al-Mulk was orchestrated by Taj al-Mulk, making it likely that Malik-Shah was aware of it.
The deposition of Nizam al-Mulk was a win for both Tarkan Khatun and her supporters, as well as the Isma'ilis who enjoyed the support of Taj al-Mulk. When the Sultan reached Baghdad, Taj al-Mulk prohibited the soldiers from entering the houses of Baghdad's population and looting the city. He also bought ten days for al-Muqtadi, who had to leave the city at the order of Malik-Shah. But the subsequent events weren't in favor of Taj al-Mulk. Malik-Shah suddenly died only a month and a few days after the death of Nizam al-Mulk. In the following civil war between Berkyaruq (the official heir) and Malik-Ismail (supported by Tarkan Khatun), the latter was defeated in a battle near Boroujerd. Taj al-Mulk was arrested, and Berkyaruq (who was aware of his competency) at first decided to grant him the post of viziership, but he was assassinated by the supporters of Nizam al-Mulk who considered him responsible for the death of Nizam al-Mulk.
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