Retowski

Retowski, O. Die Münzen der Komnenen von Trapezunt. (Braunschweig, 1974).

Coins of the Comnenus Family of Trebizond.

History and coinage of Trebizond Emperors from Alexius I (1204-1224) to David (1458-1461). German text, Hardcover, cloth, 4to, dust jacket. viii, 190 pages, 15 plates of the coins of the Trebizond. A much better compilation than Wroth's BMC and still the only specialized work to cover the Trebizond Empire. Originally written in Moscow in 1910.

Also see:
Retowski Girei
Retowski Genoese-Tartar