St. Francis of Assisi - G. K. Chesterton - Francis of Assisi is, after Mary of Nazareth, perhaps the greatest saint in the Christian calendar, and one of the most influential men in the whole of human history. By universal acclaim, this biography by G. K. Chesterton is considered the best appreciation of Francis's life--the one that gets to the heart of the matter.G. K. Chesterton (1874-1936) was a prolific English journalist and author best known for his mystery series featuring the priest-detective Father Brown and for the metaphysical thriller The Man Who Was Thursday. Baptized into the Church of England, Chesterton underwent a crisis of faith as a young man and became fascinated with the occult. He eventually converted toRomanCatholicism and published some of Christianity's most influential apologetics, including Heretics and Orthodoxy.