The Capuchins were brought to Olesko in 1733 by Volyn voivode Josef Seweryn Rzewuski and his wife Antonina, née Potocka. The couple also founded a church and a monastery. The designer remains unknown. Most probably an external scheme was used. The construction was supervised by Fr Andrzej Szydłowiec. According to other sources, Fr Andrzej Dobrowski.

At the time, the complex was one of the most opulent in the whole of the Republic, due to its expensive furnishings, library, but also the carefully constructed garden. In addition, there was a theological study for young monks at the monastery. In 1785, the order was suppressed and the monastery and church were handed over to the army. The Capuchins managed to regain some of the buildings in 1823. From 1941 to 1943, a concentration camp established by the Germans operated on the site. After the Second World War, the Communists used the buildings for an agricultural school. In 1980 the complex was taken over by the Lviv Picture Gallery. A conference hall was set up in the church, and the monastery was converted into an art storage facility.

Architecture

The complex is inscribed into the slight hill on which the castle stands, by the road leading into town. The wide, two-bay nave is accompanied by two pairs of low chapels and a tapered chancel facing west. The single-span choir is separated from the chancel by an altar. The walls are composed with lisens imitating Tuscan-style pilasters. The lisens are ornaments imitating incomplete columns, partially emerging from the plane. Their purpose is not only to beautify, but also to strengthen the wall structure. The nave and sacristy, on the other hand, have a barrel vault with lunettes, and the chapels have cross vaults. The floor was made of square marble slabs in brownish red. In the room next to the sacristy, the floor is made of grey stone.

Other important elements associated with the decoration and furnishings of the complex include:

- The statue of St Francis located in front of the church facade (mid-18th century),

- The statue of St. Onufry located in front of the church façade (mid-18th century),

- Statue of Our Lady of the Immaculate Conception located in front of the church façade (mid 18th century),

- Altarpiece to St Lawrence of Brindisi dating from after 1768,

- Altarpiece of St Fidelis (1762-1765).