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It was a small detail, and the change was a mere matter of custom and policy and involved no disloyalty to the great past in Fontana's life. This would account for the Aldobrandini frieze. The eagle seems at first more difficult to explain. From the accession of Paul V the eagle denotes the Borghese family; but Paul V did not become Pope until 16o5, and Fontana left Rome for Naples in 1596. Therefore, the eagle of this fountain cannot have any connection with the Borghese family. Why did Fontana use it instead of the lion's head, which was another of Sixtus V's emblems and would have made a better architectural outlet for the water ? It must have been because the eagle is the emblem of St. John. In Michelangelo's fresco of the Fourth Evangelist in the Sixtine Chapel the eagle stands with bent head and folded wings close against the figure of the saint who, seated upon the ground, is writing in the scroll supported by his knee. Fontana, or the sculptor who carved for him the figure on the top of the mostra of this fountain, was undoubtedly inspired by Michelangelo's creation. The St. John of the fountain was, according to the old engravings, a beau-ful and youthful figure looking to Heaven for inspiration and writing in the scroll held upon his knee. The eagle was wanting, but Fontana placed him just below the cornice between the curving tails of the dolphins, and adapted him to the purposes of a fountain. The design was original and extremely interesting, as it shows
both Sixtus V and Fontana in a new and unusual light. They were dominated by the place. The great new Lateran Palace which they had built, the ancient obelisk which they had set up, the fountain which supplied the invaluable Acqua Felice, were all subservient to the venerable basilica of St. John. The piazza and all that it contained were dedicated to St. John, and had been so for seven hundred years. Pope and architect may have felt that in this fountain the insignia of any pontiff were more fittingly kept in a purely subordinate position.
The mostra of the old fountain rested, as the present one does, on the base of the obelisk; and the fine Piranesi engraving of the Piazza of the Lateran shows its position and proportions as well as the admirable balance which it gives to the entire scene.
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