Ahmad ibn Nizam al-Mulk

Ḍiyaʾ al-Mulk Aḥmad ibn Niẓām al-Mulk (Persian: ضیاءالملک احمد بن نظام‌الملک‎‎), was a Persian vizier of the Seljuq Empire and then the Abbasid Caliphate. He was the son of Nizam al-Mulk, one of the most famous viziers of the Seljuq Empire.

Ahmad was born in Balkh, he was the son of Nizam al-Mulk, and a Georgian princess, who was the niece or daughter of Bagrat III of Georgia. During the lifetime of his father, Ahmad lived in Hamadan and Isfahan, and continued to do so in a few years after his father's death.

In 1106/1107, he went to the court of Sultan Muhammad I to file a complaint against the rais (head) of Hamadan. When Ahmad arrived to the court, Muhammad I appointed him as his vizier, replacing Sa'd al-Mulk Abu'l-Mahasen Abi who had been recently executed on suspicion of heresy. The appointment was due mainly to the reputation of his Ahmad's father. He was then given various titles which his father held (Qewam al-din, Sadr al-Islam and Nizam al-Mulk).

Ahmad was vizier for four years in which he in 1107/1108 accompanied Sultan Muhammad I during his campaign in Iraq, where his army managed to defeat and kill the Mazyadid ruler Sayf al-dawla Sadaqa ibn Mansur, who bore the title "king of the Arabs". In 1109, Muhammad I sent Ahmad and Chavli Saqavu to capture the Ismaili fortresses of Alamut and Ostavand, but they failed to achieve any decisive result and withdrew. In 1110, a Ismaili attempted to assassinate Ahmad in a mosque at Baghdad, but failed to do so. Ahmad was shortly replaced by Khatir al-Mulk Abu Mansur Maybudi as vizier of the Sejluq Empire. According to Ali ibn al-Athir, Ahmad then retired to a private life in Baghdad, but according to Anushirvan ibn Khalid, Muhammad I had Ahmad imprisoned for ten years.

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