Origin of the Eucharist the "Didache", "1 Clement" and Ignatius of Antioch provide glimpses of what Christians were doing in their eucharists. Later sources, Tertullian and the "Apostolic Tradition", offer some details from around the year 200. Once the Church "went public" after the conversion of Constantine the Great in the second decade of the fourth century, it was clear that the Eucharist was established as a central part of Christian life. Contemporary scholars debate whether Jesus meant to institute a ritual at his Last Supper; whether the Last Supper was an actual historical event in any way related to the undisputed early "Lord's
Religious images in Christian theology had no memory of pagan religious statues. Paintings of Old Testament scenes are found in Jewish catacombs of the same period, and the heavily painted walls of Dura Europos Synagogue in Syria. Catholic and Orthodox historians affirm, on the basis of these archeological finds in the Catacombs, that the veneration of icons and relics had begun well before Constantine I. Christian use of relics also dates to the catacombs, when Christians found themselves praying in the presence of the bodies of martyrs, sometimes using their tombs as altars for sharing the Eucharist, which was, and in Catholicism, Lutheranism and Eastern