Fakhr al-Mulk was a Persian bureaucrat, who served as the vizier of the Seljuk sultan Berkyaruq (r. 1092–1105) from 1095 to 1099, and later vizier of the Sejluk prince and ruler of Khurasan, Ahmad Sanjar, from 1101 to 1106.
He was the eldest son of the prominent Seljuk vizier Nizam al-Mulk.
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