Regio XIII not only contained the
Aventine Hill, but also the plain in front of it. In extent, this region was bordered by the
Tiber River to the west, the
Circus Maximus to the north, the
Vicus Piscinae Publicae and the
Via Ostiensis to the east, and the
Aurelian Walls to the south. Its principal gate through the walls was the
Porta Ostiensis. A measurement taken at the end of the 4th century recorded that the perimeter of the region was 18,000
Roman feet (approximately 5.3 km). The region contained a number of temples, including the
Temple of Diana (reportedly built by the king
Servius Tullius), the
Temple of Minerva and the
Temple of Juno Regina. It also contained several baths, including the
Baths of Licinius Sura and the
Baths of Decius. In this region, the
Armilustrium was also celebrated. Regio XIII also contained the
Emporium, the first port built on the Tiber, and attached to the port were the warehouses of the
Horrea Galbae, built around the tomb of
Servius Sulpicius Galba, while nearby was the
Forum Pistorium. The region also possessed two unusual features still present today:
Monte Testaccio, an artificial hill, and the
Pyramid of Cestius. At the turn of the 5th century, the Regio contained 17
aediculae (shrines), 130
domūs (patrician houses), 35
horrea (warehouses), 60
balneae (bath houses) and 88
loci (fountains). ==Subdivisions==