The Church of John the Baptist is one of the oldest architectural monuments in Lviv.

It is located on Stary Rynok Square, 3. According to one version, the temple was built in 1250 or 1270 by Prince Lev Danilovich for his wife Constance, daughter of the Hungarian king Bela IV. According to archival data, the church appeared no earlier than the middle of the 14th century. Studies have revealed under the layers of plaster Gothic, the so-called cross masonry, characteristic of the XIV-XV centuries. The church for some time belonged to the Catholic order of Dominican monks, then to the Uniate Armenians.

At first, the church was single-nave, 6 by 8 meters with a faceted apse. The architecture of the building has been changed by numerous reconstructions. In the 17th-18th centuries, side chapels were added to it, which gave the plan a cruciform shape. In 1800 there was a fire, and until 1836 the temple was empty. In 1887, a new restoration was carried out, and the architect Yulian Zakharevich gave the temple a neo-Romanesque style. The courtyard is surrounded by a brick fence with a three-arched bell tower.
The Church of John the Baptist now houses the Museum of Ancient Monuments of Lviv (a branch of the Lviv Art Gallery). The decision to create it was made on the basis of archaeological research, as a result of which it was revealed that a Slavic settlement existed on this site long before the founding of Lviv. The exposition of the museum presents archaeological finds, examples of fine art, church relics and historical documents that give an idea of ​​the culture, crafts and life of the population at the time of the creation and formation of Lviv. The most valuable exhibit of the museum is the icon of the middle of the XIV century "The Mother of God of Lviv".