archon
Term that designates a governor in general. When it is not used in a technical sense, it denotes members of the aristocracy, high officers of the byzantine empire and it is even used for independent princes.
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despotes
Title introduced in the 12th century. In administrative hierarchy, the office of despotes was under the emperor and the co-emperor. From the 14th century onwards, the title was given to the governors of the Byzantine Peloponnese.
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donor
Whoever subscribes, financialy, to the errection of a certain structure (monument etc). In the case of the buildings, donors might lawfully relate to them via a special connection (usufruct or other).
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khan (Ilkhan), khagan
This title was used in Turkic and Mongolian languages to designate the supreme ruler. The Byzantines used it to refer to the rulers of the Avars, Khazars, Turks and Bulgarians.
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