Our Lady of Heliopolis Co-Cathedral, also the Latin Cathedral of Our Lady of Heliopolis or the Basilica of the Holy Virgin, is a Catholic church located in the city of Cairo in Egypt. It was built in 1911 AD in the style of the Byzantine Hagia Sophia Church, by order of Baron Édouard Empain (a Belgian engineer and industrialist who came to Egypt in the year 1904 and established several projects). The church was designed by the French architect Alexandre Marcel.