Aquae Calidae, Bulgaria Aquae Calidae, Bulgaria Aquae Calidae (Latin for warm waters), also known as Therma and Thermopolis in the Middle Ages, was an ancient town in Thrace located in the territory of today's Bulgarian port city of Burgas. It was built around thermal baths using the hot springs and became one of the most important spa centres of ancient times. The site and baths of Aquae Calidae have been visited in the course of history by several important rulers from Philip II of Macedon to the Eastern Roman emperors Justinian I and Constantine IV, the Bulgarian ruler Terwel and the Ottoman Sultan
Roman Dacia towns". Therefore, categorizing sites as small towns has largely focused on identifying sites that had some evidence of industry and trade, and not simply a basic agricultural economic unit that would almost exclusively produce goods for its own existence. Additional settlements along the principal route within Roman Dacia are mentioned in the "Tabula Peutingeriana". These include Brucla, Blandiana, Germisara, Petris, and Aquae. Both Germisara and Aquae were sites where natural thermal springs were accessible, and each are still functioning today. The locations of Brucla, Blandiana, and Petris are not known for certain. In the case of Petris however, there is