 They were built in the early empire, possibly under the Emperor Tiberius (14–37 AD), much later than the others and thus were located outside the walls where land was more easily available; by this time the walls had lost their defensive role.The baths also benefitted from the increased supply of running water after the connection of the city to the Aqua Augusta aqueduct in 30–20 BC.The bathhouse was renovated after the earthquake of 62 AD, in which a "piscina calida", a heated swimming pool, was added to the north of the complex.