The establishment of the castle-town of Jarosław according to tradition is associated with the rule of the Ruthenian Prince Yaroslav the Wise of the Rurik dynasty, reigning in the years 1016-1054. In the history of Poland the character of the prince is connected with the so-called Kiev Expedition (intervention in the Kievan succession crisis) of Bolesław I the Great during which the king of Poland conquered Kiev. In 1031, Prince Yaroslav regained the terrains where nowadays the town is located, i.e. Cherven Towns, and erected on the hill of St Nicholaus a defensive castle-town which was aimed at warding the Polish-Ruthenian borderland. The Prince called the town his name and put his army and governors there. In those days Ruthenians occupied a greater part of Jarosław.
Only at a later period historical town districts developed. People of various nationalities and Ruthenians focused in one district, called Przedmieście Ruskie (the Suburb of Ruthenia).
Przedmieście Ruskie was outside the town walls on the north side and covered the areas of today's Pasieka, the suburbs of Dolnoleżajskie and Gornoleżajskie and Wola, that is, the streets from the Krakow Gate towards Przeworsk. At the moment, we call the area Przedmieście Leżajskie.
In the area of Przedmieście Ruskie most of the inhabitants were Eastern rite Christians, therefore, the Orthodox Church of the Dormition of the Virgin Mary was built. To this day, only the presbytery has remained which is located in Czesława Puzon pseudonym ‘Baśka’ town park. The park is located on the site of a former Greek Catholic cemetery.