Yusuf ibn Firuz
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. 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. 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.
- Setton 1969, p. 707.
- Setton 1969, p. 117.
- Runciman 1951, p. 196.
- Runciman, Steven (1951). A History of the Crusades, Volume II: The Kingdom of Jerusalem and the Frankish East, 1100-1187. Cambridge University Press. ISBN 9780521347716.
- Setton, Kenneth M.; Baldwin, Marshall W., eds. (1969) . A History of the Crusades, Volume I: The First Hundred Years (Second ed.). Madison, Milwaukee, and London: University of Wisconsin Press. p. 707. ISBN 0-299-04834-9.