In 1912 remains were found of baths below Via dei Vigili (below the second century street), to the south-east of the Barracks of the Fire Brigade. A raised floor was found (suspensura). The remains have been dated to the reign of Claudius (c. 50 AD), that is shortly after Ostia received its first aqueduct. Of great interest is a black-and-white mosaic (13 x 9 metres) belonging to the building.
Drawing of the mosaic. From NSc 1912, p. 207.In the centre are four dolphins, referring to the sea. To the right of the dolphins are two male, winged heads, one bearded and one unbearded. These represent winds. Two other heads represent provinces: a female head with an olive wreath is the personification of Spain; the triskeles (three legs) is the symbol of Sicily. To the left of the dolphins are two more winds, and two more provinces: a female head with a crocodile is the personification of Egypt; a female head with an elephant's head and tusks refers to Africa. Shields and spears refer to the conquering of the provinces.
The mosaic is of course related to the building of the harbour of Claudius at Portus: the city of Rome relied on Sicily, Egypt and Africa for most of its grain, while Spain was a major oil-exporting province.
