This book is a comparative study of two Church Communities, specifically the Anglican Communion and the Universal Catholic Church. It demonstrates what caused the Church in England to break away from the Catholic Church, and focuses on how English Law has influenced the Church of England since the sixteenth century, and how the Common Law system has molded its doctrine and ecclesiology. In its comparison, it follows the Churches' histories from their inception up until the English Reformation. It highlights the differences between the two Church Communities from that time, and gives a detailed study of the two Church Communities' understanding of law, authority and ecclesiology and how these influence the governing aspects of their respective communities. Concomitantly, it discusses the differences between the two main figures of each Community, the Pope and the Archbishop of Canterbury. This book will appeal to Anglicans, Catholics, historians, lawyers, theologians and Christians in general.