The Benedictine Monastery in Przemyśl was founded thanks to Mother Mortęska, the abbess of the Benedictine monastery in Chełmno. She established a monastery in Jarosław, to which in 1611 Duchess Anna Ostrogska brought nuns from Chełmno. The beginnings of the monastery in Przemyśl date back to 1616, when Father Maciej Wolkiewicz erected the first wooden chapel of the Holy Trinity on the other bank of the San River. He also helped to bring a few nuns from Jarosław in 1626, who started the construction of a small monastery. In 1629 regular monastic life began and in 1694 it became an Abbey. The present, late Baroque church was built in the years 1768-1777, and comprise the oldest buildings on Przemyśl's left bank. The complex was surrounded by defensive walls, complete with arrow slits and a tower - fragments of which, plus 350m of the walls, are still intact today.

During the German-Soviet fights in 1941, the monastery and school buildings were destroyed by fire. Fortunately, the fire did not destroy the church building, but only its roof. Thanks to this, valuable manuscripts and old prints of the convent were saved. After the war, the monastery and the church were renovated. The most valuable monument of the church are the wall polychromes painted by Stanisław Stroiński in the 1780s, which have been recently restored. Visiting is only possible during mass, but if you do get inside the church, you'll see Baroque frescoes by Stanisław Stroiński, a Rococo choir grille, and a Baroque alabaster tabernacle from 1880 in the main altar.