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History: Roman Bath

See also: Categories: Pool, History: Swimming Pools & Bath


By definition Roman Bath is a complex of public buildings, in the time of Ancient Rome, in which bathing took place as a social activity.


Roman Baths have existed in Roman civilization since the 2nd century BC and were initially for men only. Some scholars say that they were considered places for important matters and business to be discussed and thus there was no need to consider an area for women. Eventually Roman baths have been extended to provide services to women and common citizens.

Baths for bathing and relaxing became a common feature of Roman cities throughout the empire. Some of the huge bath complexes included a wide diversity of rooms offering different activities and temperatures such as swimming pools, places to read, relax, socialize and gather for a business matters. Roman baths, with their need for large open spaces, were also important drivers in the evolution of architecture offering the first dome structures in Classical architecture

Typical elements of Roman Bath

Typical bath complex features included:

  • Apodyterium - changing rooms.
  • Palaestrae - exercise rooms.
  • Notatio - open-air swimming pool.
  • Laconica and Sudatoria - superheated dry and wet sweating-rooms.
  • Calidarium - hot room, heated and with a hot-water pool and a separate basin on a stand (labrum)
  • Tepidarium - warm room, indirectly heated and with a tepid pool.
  • Frigidarium - cool room, unheated and with a cold-water basin, often monumental in size and domed, it was the heart of the baths complex.
  • Rooms for massage and other health treatments.

Additional facilities could include cold-water plunge baths, private baths, toilets, libraries, lecture halls, fountains, and outdoor gardens.

Heating Systems

The first baths seem to have lacked a high degree of planning and were often unsightly assemblages of diverse structures. However, by the 1st century CE the baths became beautifully symmetrical and harmonious structures, often set in gardens and parks. Early baths were heated using braziers, but from the 1st century BCE more sophisticated heating systems were used such as under-floor (hypocaust) heating fueled by wood-burning furnaces (prafurniae). This was not a new idea as Greek baths also employed such a system but, as was typical of the Romans, they took an idea and improved upon it for maximum efficiency. The huge fires from the furnaces sent warm air under the raised floor (suspensurae) which stood on narrow pillars (pilae) of solid stone, hollow cylinders, or polygonal or circular bricks. The floors were paved over with about 23 inch (60 cm) square tiles (bipedales) which were then covered in decorative mosaics.

Walls could also provide heating with the insertion of hollow rectangular tubes (tubuli) which carried the hot air provided by the furnaces. In addition, special bricks (tegulae mammatae) had bosses at the corners of one side which trapped hot air and increased insulation against heat loss. The use of glass for windows from the 1st century CE also permitted a better regulation of temperatures and allowed the sun to add its own heat to the room.

The vast amount of water needed for the larger baths was supplied by purpose built aqueducts and regulated by huge reservoirs in the baths complex. The reservoir of the Baths of Diocletian in Rome, for example, could hold 20,000 m³ of water. Water was heated in large lead boilers fitted over the furnaces. The water could be added (via lead pipes) to the heated pools by using a bronze half-cylinder (testudo) connected to the boilers. Once released into the pool the hot water circulated by convection.

The largest bath complexes in Roman Empire

The Baths of Caracalla in the southern area of Rome are perhaps the best preserved of all Roman baths and were second only in size to Trajan’s Baths of Rome (c. 104 AD). They were also the most sumptuous and luxurious Roman baths ever built. Finally completed in 235 AD, huge walls and arches still stand and attest to the imposing dimensions of the complex which used some 6.9 million bricks and had 252 interior columns. Reaching a height of up to 98 ft. (30 meters) and covering an area of 1105 x 1076 feet (337 x 328 meters), they incorporate all the classic elements one would expect, including a 3’-2” (1 meter) deep Olympic-size swimming pool and an unusual circular caldarium which reached the same height as Rome’s Pantheon and spanned 118 ft. (36 meters). The caldarium also had large glass windows to take advantage of the sun’s heat and further facilities included two libraries, a watermill, and even a waterfall.

The complex had four entrances and could have accommodated as many as 8,000 daily visitors. 6,300 m³ of marble and granite lined the walls, the ceiling was decorated with glass mosaic which reflected light from the pools in an iridescent effect, there was a pair of 19’-6” (6 m) long fountains, and the second floor provided a promenade terrace. Water was supplied by the aqua Nova Antoniniana and aqua Marcia aqueducts and local springs and stored in 18 cisterns. The baths were heated by 50 furnaces which burned ten tons of wood a day. Besides the imposing ruined walls, the site has many rooms which still contain their original marble mosaic flooring and large fragments also survive from the upper floors depicting fish scales and scenes of mythical sea creatures.

Influence on architecture

Baths and the need to create large airy rooms with lofty ceilings brought the development of the architectural dome. The earliest surviving dome in Roman architecture is from the frigidarium of the Stabian Baths at Pompeii, which dates to the 2nd century BCE. The development of concrete in the form of stiff mortared rubble allowed unsupported walls to be built ever wider apart, as did hollow brick barrel vaults supported by buttress arches and the use of iron tie bars. These features would become widely used in other public buildings and especially in large constructions such as basilicae. Even in modern times Roman baths have continued to influence designers, for example, both the Chicago Railroad Station and the Pennsylvania Station in New York have perfectly copied the architecture of the great frigidarium of the Baths of Caracalla.

Quick Facts

The following bath complexes included most of the bath features with their well-preserved domes

  • 100 AD the large bath complexes of Timgad at Ephesos (Roman colonial town in the Aurès Mountains of Algeria)
  • 104 AD Trajan’s Baths of Rome
  • 137 AD the Bath of Lepcis Magna (Roman colonial town in currently Libya)
  • 162 AD the Antonine Baths at Carthage (Roman colonial town in currently Tunisia)
  • 305 AD the Baths of Diocletian in Rome


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