The Church of St. Pierre, located at the foothills of Mt Pilgrimage (Hac Dağı) in Hatay province is one of the most significant centers of Christianity. The cave known as the location where St. Peter had given his first sermon was upgraded and turned into a church after the Romans had adopted Christianity. The church was a harbor to the first Christians and the first pope, St. Peter, and contributed to the spread of Christianity in the world.