Twenty-nine in all, these letters cover all but three of Cyril's years as a bishop. The first twelve were published in 2009 (Fathers of the Church 118). The present volume completes the set. Festal letters were used in Alexandria primarily to announce the beginning of Lent and the date of Easter. They also served a catechetical purpose, however, allowing the Patriarch an annual opportunity to write pastorally not just about issues facing the entire see, but also about the theological issues of the day.