Ancient Greek religion
During the period of classical antiquity, main religion in the region of Macedonia was the Ancient Greek religion. After the Roman conquest of Macedonia, the Ancient Roman religion was also introduced. Many ancient religious monuments, dedicated to Greek and Roman deities are preserved in this region. During the period of Early Christianity, ecclesiastical structure was established in the region of Macedonia, and the see of Thessaloniki became the metropolitan diocese of the Roman province of Macedonia. The archbishop of Thessaloniki also became the senior ecclesiastical primate of the entire Eastern Illyricum, and in 535 his jurisdiction was reduced to the administrative territory of the Diocese of Macedonia. Later it came under the jurisdiction of the Ecumenical Patriarch of Constantinople.