The Church of St Petka of the Saddlers is a medieval Bulgarian Orthodox church in Sofia, the capital of Bulgaria. It is a small one-naved building partially dug into the ground located in the very centre of both the modern and the antique city, in the TZUM subway. The church features a semi-cylindrical vault, a hemispherical apse, and a crypt discovered during excavations after the Second World War. The walls are 1 m thick and made from brick and stone. The church was first mentioned in the 16th century and was constructed at the place of a former Roman religious building. It is today a monument of culture known for its mural paintings from the 14th, 15th, 17th and 19th century depicting biblical scenes.