The construction of the Aosta Theater is believed to have occurred a few decades after the foundation of the city, in 25 BC.: in fact, remains of pre-existing buildings have been found in the area. The amphitheater dates back to theemperor Claudio.
Together with the amphitheater, placed on the same axis, it occupies three blocks contiguous to the walls, along the main street of the city, the Decumano maximum, near the Porta Prætoria.
The theater occupied an area of 81 m in width and 64 m in length. The cavea it was inserted in a rectangular plan enclosure, whose external facade is preserved for a height of 22 m on the southern side; its facade was distinguished by a series of vertical buttresses placed at 5,5 m distance from each other and lightened by four orders of openings: below, the entrance arches and, upwards, three orders of superimposed windows , of different shape. This insertion suggested the existence of a cover, which was to make the building a theatrum tectum, similar to that of Pompei.
The steps of the cavea could accommodate 3.500 / 4.000 spectators, the theater orchestra had a radius of 10 m. The wall of the scene, of which only the foundations remain, was decorated with Corinthian columns and statues and covered with marble.
The theater is not perfectly semicircular but has a somewhat rectangular shape; it is 22 m high and has been perfectly preserved.
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