Principality of Halych
Peremyshl, although originally subordinate to the Principality of Vladimir-in-Volhynia, remained a semi-independent principality into the middle of the 13th century and beyond. Although the details are not always available, it formed part of the orbit of the emerging Principality of Halych. During the conflict between Rostislav Mikhailovich and Daniil Romanovich (formerly its prince), it was one of the former's strongholds; its bishop supported Rostislav, and when Rostislav occupied Halych, he appointed Konstantin of Ryazan to oversee Peremyshl. Peremyshl is known to have been the main fort of Boleslaw-Yuri, King of Rus, going into Polish hands after his death.