The Church of St Constantine and Helena (Bulgarian: Св. Св. Константин и Елена) is a church in Plovdiv, Bulgaria. It is considered to be among the oldest churches in the city. It was built in 337 at the sight of an ancient pagan temple in the acropolis on one of the fortified hills. The church was named after Emperor Constantine the Great and his mother Elena. During the years, the building was destroyed and rebuilt several times. Its current edifice was constructed in 1832 with the help of local patriots. Its magnificent frescoes and icons were painted by masters of one of the most famous Bulgarian Icongraphic Schools: the Debar School.