Principality of Halych
A fortified settlement located on the left (north-eastern) shore of the Prut dating back to the time of the Principality of Halych was built by Grand Prince Yaroslav Osmomysl in the second half of the 12th century. In the List of Russian Cities Far and Near (c. 1370) there is a settlement Chern on the Prut located in the northwestern part of modern Chervivtsi..