The St. Constantine and Helena Church is one of the oldest Christian temples in Plovdiv. It was built on top of the fortified acropolis wall. After the recognition of the Christian religion as an official one, the existing then hidden temple outside the acropolis walls, was moved here and dedicated to the great emperor and his mother. It was ruined and reconstructed several times by Romans, Greeks, Turks and Bulgarians.

     The paints inside St. Constantine and Helena Church have preserved their unfading brighitness ever since. The iconostasis is with baroque carving and polychrome decoration and gilt, and the two rows of icons were painted by Zahari Zograf, a renaissance artist. The icon-painters Nikola Odrinchanin and Stanislav Dospevski also worked here. The temple is in ensemble with the other buildings in the yard - former school, male convent as well as the bell tower with a height of 13 meters.