This document provides an overview of the history and development of Christian liturgy from its origins with the Apostles to the Middle Ages. It discusses the early liturgies of Alexandria, Rome, Jerusalem, and Antioch that were developed based on oral traditions passed down from the Apostles. It then describes how these liturgical traditions evolved and spread, with some facing changes like the introduction of choirs that reduced congregational participation. The Egyptians maintained closer continuity with early liturgical traditions while other churches experienced more dramatic changes and reductions in congregational involvement over the medieval period.