Dating back to the third century AD, the arch is made up of two columns that frame the façade and an architrave above which a triangular tympanum is placed. What we see today is only a part of the work, originally composed of several arches and covered in marble.
At the beginning of the 5th century, under the Emperor Honorius, the arch was connected to Porta San Sebastiano with two defensive walls no more existing today.
Photo credits: Courtesy of Parco Archeologico dell'Appia Antica official site
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