Thermae be applied to those magnificent edifices which grew up under the empire, in place of the simple balneae of the republic, and which comprised within their range of buildings all the appurtenances belonging to the Greek gymnasia, as well as a regular establishment appropriated for bathing. Writers, however, use these terms without distinction. Thus the baths erected by Claudius Etruscus, the freedman of the Emperor Claudius, are styled by Statius "balnea", and by Martial "Etrusci thermulae". In an epigram by "Martial"—"subice balneum thermis"—the terms are not applied to the whole building, but to two different chambers in the same edifice.
Ancient Roman architecture were also provided for private villas, town houses and forts. They were normally supplied with water from an adjacent river or stream, or by aqueduct. The design of thermae is discussed by Vitruvius in De Architectura. Roman temples were among the most important and richest buildings in Roman culture, though only a few survive in any sort of complete state. Their construction and maintenance was a major part of ancient Roman religion, and all towns of any importance had at least one main temple, as well as smaller shrines. The main room "(cella)" housed the cult image of the deity