ediate block was elongated and apparently given a pitched roof, and the interior diameter of the rotunda was eighty feet as opposed to the Pantheon's one hundred and fifty. The cylinder was of cut stone and the dome of brick. The Pantheon's niches were repeated, but the stairs were put to the back.
             There was a similar structure known as the Round Temple at Ostia dating back from about 230 or 240. Here the porch was widened to fill the breadth of a Pantheon-like court.
             The rotunda is sixty Roman feet in diameter, and the seven niches of the Pantheon appear, though of rather different shapes. An important change has taken place, however, for the transverse niches and the apse, expanded to a greater size in relation to the volume of the whole than at the Pantheon, project beyond the exterior wall of the rotunda.
             Another, somewhat smaller version was built in Rome quite early in the fourth century, the so-called temple of Romulus beside the ancient Sacred Way. It may have been the tomb of a young prince who died in 309, but nobody really knows. There was no room f
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