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.
Roman Thermae of Maximinus was constructed. At the end of the 3rd century, the complex was profoundly remodelled, resulting in the substantial reduction in the total area occupied by the thermae; the remodelling of the urban structure was part of the ongoing redesign of Bracara Augusta, into the provincial capital of Gallaecia by Diocletian. This meant that by the 4th century even the theatre was deactivated, and the stones used to construct the city walls. In fact, the remnants encountered confirm the existence of three periods of construction, starting with the first, which corresponds to the pre-thermae period of Julius Caesar and Claudius. The