The office of vizier was superseded by the emir al Omra, Imperator Imperatorum, a title first instituted by Radhi, and which merged at length in the Bowides and Seljukides:
vectigalibus, et tributis, et curiis per omnes regiones praefecit, jussitque in omnibus suggestis nominis ejus in concionibus mentionem fieri (Abulpharagius, Dynart. p 199).
It is likewise mentioned by Elmacin, (p. 254, 255).