Imeritia, in the fourteenth century, formed part of the kingdom of Georgia. It afterward became independent, and was governed by its own princes ; one of whom, in 1804, voluntarily made it over to Russia.
The province of Mingrelia (the ancient Colchis, and the scene of the fable of the Golden Fleece and the Argonautic expedition) is bounded on the north by the Caucasus, on the east by Imeritia, on the south by Guria, on the southwest by the Black sea, and on the northwest by Abassia. Its area is about seven thousand two hundred square miles.
see more - The Caucasian Provinces
Sears, Robert. An Illustrated Description of the Russian Empire. New York: Robert Sears, 1855