The Roman gate takes its name from a sarcophagus lid bearing two lions and now found in the gardens at the end of the street opposite S.Fermo.
The remains of one of the two polygonal towers can still be seen below the roadway, as can - next to a house - part of the facade that overlooked the city. This facade still contains a brick section from the oldest part of the gate (mid 1st century BC), faced with local white stone that was added halfway through the 1st century AD. In the prospect, slim spiral columns flank the large upper exedra.