Terme di Diocleziano

Turismo Roma, Roma Capitale's tourism service, records that construction of the Baths of Diocletian was begun by the emperor Maximian in 298 AD and that the complex was inaugurated between 305 and 306 and dedicated to Diocletian, with whom Maximian shared command of the empire. Turismo Roma gives the extent as 13 hectares and the capacity as up to 3,000 people, and says the central axis of calidarium, tepidarium and frigidarium is still legible in the Basilica of Santa Maria degli Angeli e dei Martiri. The complex remained in use until the middle of the 6th century, when the Gothic war interrupted its water supply.

Turismo Roma also places the octagonal hall of the baths in the western corner, at the junction with today's Via Parigi, and says that a circular hall on the west side of the complex was turned into the church of San Bernardo alle Terme. Almost everything a visitor sees on this side of the rione is something later built into, or against, these ruins.