The façade, flanked by two towers with cupolas, is decorated with arcades filled in with statuary and sculpture, the whole representing the Last Judgment.
It rests on a series of arcades supported by white marble columns.
And of the whole 230 ft., so that it is a building of considerable size; the stage is well preserved and so are parts of the external arcades of the auditorium.
It is an octagon, with a dome; in the interior are two arcades one above the other.
Freeman, on account of the Romanesque character of the architecture, thought it probable that it really belongs to the time of the Lombard kings, and his opinion is shared by Ricci and Rivoira, who consider it to be a guardhouse erected by the exarchs, recent explorations having made it clear that it was an addition to the palace, while mosaic pavements and an atrium once surrounded by arcades really belonging to the latter were found in 1870 behind S.
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