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Simplified plan of Portus

1 Internal mole. 2 Claudian portico. 3 Harbour for smaller boats (so-called "Darsena"). 4 Porticus Placidiana. 5 Small lighthouse. 6 Baths. 7 Small theatre. 8 "Imperial palace". 9 City wall. 10 Colossal statue of Trajan. 11 Temple of Liber Pater. 12 Villa Torlonia. 13 Aqueduct. 14 "Temple of Portumnus". 15 Defensive cross-wall with towers. 16 Horrea. 17 Barracks of the fire-brigade? 18 Bishop's palace. 19 Tower. 20 Temple. 21 Church of St. Peter and St. Paul. 22 Foro Olitorio. 23 Grandi Magazzini di Traiano. 24 Grandi magazzini di Settimio Severo.

Plan by Jan Theo Bakker, after R. Meiggs, Roman Ostia, Oxford 1973, figs. 5 and 6.