Eastern Orthodox Christianity is today the religion of only a minority in Turkey. It was once the dominant religion, during the time of the Byzantine Empire, as the region that comprises Turkey today was a central part of the Byzantine heritage. Today, less than one tenth of one percent of the population are Orthodox Christians. The provinces of Istanbul and Hatay, which includes Antakya, are the main centers of Christianity in Turkey, with comparatively dense Christian populations, though they are minorities in these areas. The traditional variant of Orthodox Christianity present in Turkey is the Eastern Orthodox branch, focused mainly in the Greek Orthodox Church.