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
Eucharist in the Catholic Church celebration of the full meal, abuses denounced by the apostles Paul and Jude, led to a distinct celebration of the Eucharist. The form of this celebration in the middle of the second century is described by Justin Martyr as very similar to today's Eucharistic rites known in the West as the Mass and in much of the East as the Divine Liturgy. The regular celebration was held each week on the day called Sunday, which Christians were also calling the Lord's Day. They included readings from Scripture, a homily, prayer by all, a prayer by "the president of the brethren"