St. Gregory’s merciful doctrine of purgatory also suggested those pictures so often found in chapels dedicated to the service of the dead, in which he is represented in the attitude of supplication, while on one side, or in the background, angels are raising the tormented souls out of the flames. In ecclesiastical decoration I have seen the two popes, St. Gelasius, who reformed the calendar in 494, and St. Celestinus, who arranged the discipline of the monastic orders, added to the series of beatified Doctors of the Church. II. THE FOUR GREEK FATHERS. The Four Greek Fathers are St. John Chrysostom, St. Basil the Great, St. Athanasius, and St. Gregory Nazianzen. To these, in Greek pictures, a fifth is generally added, St. Cyril of Alexandria. From the time of the schism between the Eastern and Western Churches, these venerable personages, who once exercised such an influence over all Christendom, who preceded the Latin Fathers, and were in fact their teachers, have been almost banished from the religious representations of the west of Europe. When they are introduced collectively as a part of the decoration of an ecclesiastical edifice, we may conclude in general, that the work is Byzantine and executed under the influence of Greek artists. A signal example is the central dome of the baptistery of St. Mark’s at Venice, executed by Greek artists of the 12th and 13th centuries. In the four spandrils of the vault are the Greek Fathers seated, writing (if I well remember), and in the purest Byzantine style of art. They occupy the same places here that we find usually occupied by the Latin Doctors in church decoration: each has his name inscribed in Greek characters. We have exactly the same representation in the Cathedral of Monreale at Palermo. The Greek Fathers have no attributes to distinguish them, and the general custom in Byzantine Art of inscribing the names over each figure renders this unnecessary: in general, each holds a book, or, in some instances, a scroll, which represents his writings; while the right hand is raised in benediction, in the Greek manner, the first and second finger extended, and the thumb and third finger forming a cross. According to the formula published by M. Didron, each of the Greek Fathers bears on a scroll the first words of some remarkable passage from his works: thus, St. John Chrysostom has ‘God, our God, who hath given us for food the bread of life,’ &c.: St. Basil, ‘None of those who are in the bondage of fleshly desires are worthy,’ &c.: St. Athanasius, ‘Often, and anew, do we flee to thee, O God,’ &c.: St. Gregory Nazianzen, ‘God, the holy among the holies, the thrice holy,’ &c.: and St. Cyril, ‘Above all, a Virgin without sin or blemish,’ &c. [Illustration: _The five Greek Fathers._]