This first eucharistic prayer, or Roman Canon, in older that the rest and has its origins in the pre-Christian era. The Roman canon is so full of theological depth that much of Catholic doctrine can be deduced from it. What is even more intriguing is the development that it undertook so quickly in the early centuries of the church. The history and theology of the Roman Canon was also influential in the catechesis of the faithful. The Roman Canon has a long and stories history, The great saints of Christendom had their hands on its development, and consequently, its theology. In this book I look at the theology and history of the Roman Canon, and why that theology is important in teaching the faith.