Al-Qasim ibn Ubayd Allah

Abu'l-Husayn al-Qasim ibn Ubayd Allah (Arabic: أبو الحسين القاسم بن عبيد الله‎) was a senior official of the Abbasid Caliphate who served as vizier from April 901 until his own death in October 904.

Wali al-Dawla

Al-Qasim ibn Ubayd Allah
القاسم بن عبيد الله
Abbasid Caliphate
DiedOctober 904
Baghdad, Abbasid Caliphate
Other names
  • Abu'l-Husayn
  • Ibn Ubayd Allah
  • Wali al-Dawla (title)
OccupationAbbasid vizier and official
Years activeApril 901 – October 904
(under Al-Muktafi)

Hailing from the Banu Wahb, a family of Nestorian Christian origin that had served in the caliphal bureaucracy since late Umayyad times, Ubayd Allah was the son and grandson of viziers.[1] He had served as aide to his father, Ubayd Allah ibn Sulayman, during the latter's decade-long vizierate, and then succeeded him upon his death, heading the government during the last months of the reign of al-Mu'tadid (r. 892–902) and the early years of al-Muktafi (r. 902–908). Al-Qasim largely dominated the young al-Muktafi, who awarded him with the title of Wali al-Dawla ("Protector of the Dynasty") and gave one of his daughters to one of al-Qasim's sons.[2]

Unlike his father, who was widely esteemed for his honesty and justice, al-Qasim was corrupt and cruel, ordering the executions of anyone that displeased him or presented a potential challenge, such as the Saffarid emir Amr ibn al-Layth, the general Badr al-Mu'tadidi, or the poet Ibn al-Rumi. The powerful finance secretary Ali ibn al-Furat was saved from a similar fate only by al-Qasim's illness and death. This death meant the end of the Banu Wahb's hold on power, which now passed to the Banu'l-Furat. Only a generation later would al-Qasim's sons al-Husayn and Muhammad also rise to become viziers.[2]


  1. ^ Bosworth 2002, pp. 33–34.
  2. ^ a b Bosworth 2002, p. 33.


  • Bosworth, C.E. (2002). "Wahb". In Bearman, P. J.; Bianquis, Th.; Bosworth, C. E.; van Donzel, E. & Heinrichs, W. P. (eds.). The Encyclopaedia of Islam, New Edition, Volume XI: W–Z. Leiden: E. J. Brill. pp. 33–34. ISBN 978-90-04-12756-2.
Preceded by
Ubayd Allah ibn Sulayman
Vizier of the Abbasid Caliphate
April 901 – October 904
Succeeded by
al-Abbas ibn al-Hasan al-Jarjara'i