Historical outline
Mikulińce was granted town rights in 1595. At that time it was owned by the Sieniawski family. Later on, the Zborowski family became the owners of the village (until 1637), then the Koniecpolscy family, and again the Sieniawski and Lubomirski families. It is most likely that the first church in Mikulińce was built either simultaneously with the foundation or shortly after the administrative unit was granted town rights, but references to the existence of a wooden church (dedicated to St. John the Baptist) in the sources oscillate around 1615. It is also most likely that the church was destroyed literally several years later during the Turkish-Tartar invasion. When Ludwika Potocka (of the Mniszech family) became the owner of Mikulince, she decided to fund the construction of a new church building in a contemporary style for the era. Some sources say that a chapel stood in the village at the time, while others point to a rebuilt wooden church, which was to be taken care of by the monks, who carried out pastoral services there and continued the work of the parish of St John the Baptist independently of the existence of the Holy Trinity Church.

A new building was therefore built on the new site. It was consecrated by Lviv Archbishop Wenceslas Hieronim Sierakowski in 1779, and it was probably in the 1770s that the stone sculptures adorning the façade of the church and the uniformly styled woodcarving furnishings were made.

The monastery was suppressed in 1785. After this time, the building was used as a home for the poor. The most significant events include the ferocious storm that destroyed the building in 1799, followed by the fire of 1859, which damaged the church. After the Second World War, the church was gradually destroyed. Fortunately, some of the furnishings (especially the altar sculptures) were acquired by the Lviv Picture Gallery. In 1989 the church was restored to Catholics, and after the collapse of the USSR it was renovated according to a design by Zenovy Lagush.

Architecture
The complex is situated in the midst of a secluded village, on a square in a slight slope of land. The presbytery faces north. The building is surrounded on three sides by sparse, low-rise buildings and on one side by spacious fields. Apart from the 20th-century architecture of the buildings and the low-voltage lines, the idyllic atmosphere of the village could at times act like a time machine. In other words, the buildings have not been densely encased in the fabric of modernity. On the architectural side, we are dealing with the Baroque. Researchers point out the similarities of the church to other well-known buildings. Among the most important are the Holy Trinity Cathedral in Dresden, St George's Cathedral in Lviv, the Church of S. Giorgio Modica near Ragusa in Sicily and the Church of St Roch in Paris.

The building was built of broken stone, which is particularly visible in the foundation area and in the lower part of the walls. Beyond this, it consists of fine Baroque brick. Completely plastered, it has three naves and a basilica layout. The nave is four-bay. The facade of the building is wider than the main body. It has been extended to form a spatial massif. The interior features a brick choir built into the south apse. The rooms next to the porch take the form of a single-bay stand, framed by double pilasters in the Tuscan style. In addition to the main altar, now preserved in a rather truncated form, there are altars of the Lord Jesus in the side aisles and of the Virgin Mary on the other side. The overall state of preservation of the building is indicated as correct.

The most important elements associated with the decoration, furnishings and surroundings of the church include:

• Quite well-preserved pulpit
• Sculptures of St. Peter and St. Paul on the façade attic
• Sculptures of St. John and St. Luke on the façade
• Sculptures of St. Mark and St. Matthew on the façade
• Sculpture of St. Joachim
• Sculpture of the Virgin Mary
• Relief of the Holy Trinity
• Sculptures of angels located on the main altar and the altar of the Lord Jesus
• Remains of gravestones in the churchyard
• Bell tower