subfeature of Forum (Romanum or Magnum)
Alternate names: Umbilicus Urbis
The monument has been identified since the nineteenth century with a brick cylinder with a diameter decreasing from 5.1 meters to 3 meters and height of 3 meters located behind the northeast corner of the Rostra Augusti. It was faced with marble and travertine; its surviving remains were built in the Severan period, though its earliest phase is doubtless earlier.
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