Yusuf ibn Firuz (surname also spelled Fayruz) was the military governor under successive Burid atabegs of Damascus. Ibn Firuz served first with Toghtekin and then his son Taj al-Mulk Buri after the death of the former in 1128.Setton 1969, p. 707. In 1129, Buri and ibn Firuz began the massacre of Nizari Isma'ili partisans, beginning with al-Mazdaghani, Toghtekin's vizier, killing or expelling the Assassins from the city.Setton 1969, p. 117. Ibn Firuz was a close adviser to Buri. However, when Buri was succeeded by his son Shams al-Mulk Isma'il, the latter tried to have ibn Firuz killed because he feared that Ibn Firuz was plotting his murder.Runciman 1951, p. 196.
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