[Footnote 159: This commander is styled by Nicephorus
ancient greek, a vague though not improper definition
of the caliph. Theophanes introduces th& e strange
appellation of ancient greek, which his interpreter
Goar explains by Vizir Azem.& They may approach the
truth, in assigning the active part to the minister rathe
forget that the Ommiades had only a kateb, or
secretary, and that the office of Vizir was not revived or
instituted till the 132nd vear of the Hegira (D'Herbelot, p.
912).]