The city of Bethlehem is holy to both Christians and Muslims. It is acknowledged as the birthplace of Jesus Christ or, in Arabic, Issa, who is known as the Son of God in Christian belief and a divinely inspired prophet to Muslims. The Church of the Nativity, a Byzantine basilica, was built by Helena (the mother of the Emperor Constantine), to commemorate Jesus’ birth. It is built on top of a cave where, according to a tradition first documented in the second century AD, Jesus was born. It was first dedicated in 339 AD.