Роман Мстиславич
The name "Volhynia" is first mentioned in Ruthenian chronicles as a region inhabited by a tribe called the Volhynians that was conquered by the Grand Prince of Kiev Vladimir the Great. Volhynia changed hands several times throughout the following centuries. Circa CE 1199 it was merged with the Principality of Halych, to form the Duchy (later Kingdom) of Galicia and Volhynia under Prince Roman the Great. After the death of Roman the Great in 1205, Andrew II of Hungary adopted the title of "King of Lodomeria" (as well as of Galicia), in reference to Volhynia. Although the Hungarians were driven out from Halych-Volhynia by 1221, Hungarian kings continued to add "Galicia et Lodomeria" to their official titles.