ハールィチ・ヴォルィーニ大公国
In the second part of the 12th century Berestia became the center of the small feudal duchy called Land of Berestia which was part of Kingdom of Galicia–Volhynia. In 1164 the Lithuanian Duke Skirmunt took Berestia but did not own it for a long time. Attempts in 1179 and 1182 by the Polish High Duke (or King) Kazimierz II to join Berestia to Poland were unsuccessful.