Saint Francis of Assisi (1181-1226) was an Italian Catholic friar, deacon and preacher. He founded the men's Order of Friars Minor, the women's Order of Saint Clare, the Third Order of Saint Francis and the Custody of the Holy Land. Francis is one of the most venerated religious figures in history. In Chesterton's portrayal St. Francis is a mysterious figure and a man of paradox. Putting him and his life into historical perspective, Chesterton describes why his asceticism was necessary for his cause and what drove him to his life.

G. K. Chesterton (1874-1936) was an English writer, poet, philosopher, dramatist, journalist, orator, lay theologian, biographer, and literary and art critic. Chesterton is well known for his fictional priest-detective Father Brown, and for his reasoned apologetics. Even some of those who disagree with him have recognized the wide appeal of such works as Orthodoxy and The Everlasting Man. Chesterton is often referred to as the "prince of paradox".