The four rooms may be regarded as four books, each subdivided into as many themes or cantos. In the Camera della Segnatura, the ceiling presents allegorical figures of Poetry, Jurisprudence, Philosophy, and Theology, with a large composition on the side walls corresponding to each. For Poetry we have Mount Parnassus, with Apollo and the Muses on its laurel-clustered summit, surrounded by the most famous bards and minstrels. Jurisprudence is a severely simple group, consisting of Prudence, Temperance, and Fortitude, the virtues by which justice is promoted on earth; while the text-books of Roman and Canon law are issued by Justinian and Gregory IX., in subsidiary panels. Philosophy is embodied in the famous School of Athens, as it has been incorrectly named, where fifty figures, attending a scholastic disputation between Plato and Aristotle, include the noblest names of ancient science, the selection of whom displays extraordinary knowledge of the history of mind. Theology, generally called the Disputa del Sacramento, is divided into two scenes. Seated in the heavens amid an angelic choir, the Holy Trinity is surrounded by the Madonna, the Precursor, and a glorified assemblage of patriarchs, prophets, and warriors of the Old Testament; apostles, evangelists, and martyrs of the New Dispensation. Below, the fathers of the Church and its most eminent divines expound to an audience of distinguished personages the mysteries of faith, which are symbolised by the Eucharist exposed upon an elevated altar in token of man's redemption. The stanza called that of Heliodorus has on the roof four signal manifestations of himself by the Almighty to the patriarchs. The first mural compartment represents the holiest mystery of the Romish faith established in the Miracle of Bolsena, whereby a doubting priest was supernaturally convinced of the divine presence in transubstantiation. Opposite is the miraculous deliverance from prison of St. Peter, the founder of the Romish Church; and the two corresponding subjects illustrate the power committed to his successors for arresting the invasion of pagan force personified in Attila, and for cleansing from the temple of Christ its sacrilegious plunderers, with Heliodorus at their head.