, Abū Ṭālib Rustam b. Fak̲h̲r al-Dawla ʿAlī , Kahf al-Umma , ruler of the northern Būyid amīrate of Ray and Ḏj̲ibāl (387-420/997-1029).

When Fak̲h̲r al-Dawla [q.v.] died in S̲h̲aʿbān 387/August-September 997, his young son Rustam succeeded him at the age of eight (thus according to the anonymous Mud̲j̲mal al-tawārīk̲h̲ wa ’l-ḳiṣaṣ , ed. Bahār, Tehran 1318/1939, 396, giving Rustam’s birth-date as Rabīʿ II 379/July-August 989, and Ibn al-At̲h̲īr, ed. Beirut, ix, 69, but according to al-Rūd̲h̲rāwarī, in Eclipse of the ʿAbbasid caliphate, iii, 297, and Ibn al-At̲h̲īr, ix, 132, at…