In 1923 a small cluster of tombs was found on the northern side of the Isola Sacra.
The tombs are close to Portus, approximately 150 metres to the south-west of the Basilica
of Saint Hippolytus. In antiquity the tombs formed a part of the other graves of
the necropolis and are nowadays a few hundred metres isolated from the described 100 tombs.

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