The Principality of Mingrelia was a historical state in Georgia

Georgia (country)

Georgia is a sovereign state in the Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bounded to the west by the Black Sea, to the north by Russia, to the southwest by Turkey, to the south by Armenia, and to the southeast by Azerbaijan. The capital of...

 ruled by the Dadiani

Dadiani

Dadiani was a Georgian family of nobles, dukes and princes, and a ruling dynasty of the western Georgian province of Samegrelo.- The House of Dadiani :...

 dynasty. Established as an independent Principality in 1557 by Levan I Dadiani as a hereditary mtavari

Mtavari

Mtavari was a feudal title in Georgia usually translated in English as prince.The earliest instances of the use of mtavari are in the early Georgian hagiographic texts dated to the 5th century. From the 11th to the 14th centuries, the title mtavari, along with tavadi, was synonymous with eristavi,...

(Prince), it remained independent until it became subject to Imperial Russia in 1803. The principality ultimately came to an end when Prince Niko Dadiani was deposed, and the principality abolished, by Russia in 1857. Prince Niko officially renounced his rights to the throne in 1868.