The Church calls St Constantine (306-337) "the Equal of the Apostles," and historians call him "the Great." He was the son o the Caesar Constantius Chlorus (305-306), who governed the lands of Gaul and Britain. His mother was St Helen, a Christian of humble birth. At this time the immense Roman Empire was divided into Western and Eastern halves, governed by two independent emperors and their corulers called "Caesars." Constantius Chlorus was Caesar in the Western Roman Empire. St Constantine was born in 274, possibly at Nish in Serbia. In 294, Constantius divorced Helen in order to further his political ambition by marrying a woman of noble rank. After he became emperor, Constantine showed his mother great honor and respect, granting her the imperial title "Augusta." Constantine, the future ruler of all the whole Roman Empire, was raised to respect Christianity. His father did not persecute Christians in the lands he governed. This was at a time when Christians were persecuted throughout the Roman Empire by the emperors Diocletian (284-305) and his corulers Maximian Galerius (305-311) in the East, and the emperor Maximian Hercules (284-305) in the West. After the death of Constantius Chlorus in 306, Constantine was acclaimed by the army at York as emperor of Gaul and Britain. The first act of the new emperor was to grant the freedom to practice Christianity in the lands subject to him. The pagan Maximian Galerius in the East and the fierce tyrant Maxentius in the West hated Constantine and they plotted to overthrow and kill him, but Constantine bested them in a series of battles, defeating his opponents with the help of God. He prayed to God to give him a sign which would inspire his army to fight valiantly, and the Lord showed him a radiant Sign of the Cross in the heavens with the inscription "In this Sign, conquer."

Source: Church Calender