St. Cyril served as Bishop of Alexandria in the fifth century. This collection contains prominent examples of his well-researched biblical exegesis, instructions for his diocese in celebrating important events in the Church year, and important correspondence that provides readers with insight into his attuned theological mind. Known for his opposition to the Nestorian heresy, Cyril stands as a prominent example of a Church Father who championed orthodoxy while still shepherding those entrusted to him.