To these and a hundred other temples in the classic rectangular style the architects of Rome added several circular temples, which revealed a new mastery of the problems presented by a dome. Tradition derived this type from the round hut of Romulus, religiously preserved on the Palatine for many centuries. Almost as old was the pretty Aedes Vestae, or House of Vesta, near the Temple of Castor and Pollux; its circular cella, faced with white marble, was enclosed by handsome Corinthian columns, and its roof was a dome of gilded brass. Adjoining it was the Palace of the Vestals- eighty-four rooms built cloisterwise around a peristyled court, the Atrium Vestae. The Pantheon was not yet a circular temple; as built by Agrippa it was rectangular, but had a circular plaza before it; Hadrian’s architects raised over this space the round temple and mighty dome which are still among the bravest works of man.

3. The Arcuate Revolution