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
Aquae Calidae, Algeria Aquae Calidae, Algeria Aquae Calidae was a Roman colony of the Roman province of Mauretania Caesariensis. The Roman city has been identified with ruins at Hammam Righa in the wilaya of Chlef, Algeria, North Africa. The ruins are located at latitude 36.379474N, longitude 2.395618E near the railway town of Boumedfaâ, and is on the Oued Djer River. The Roman colony was founded by Augustus and flourished from 30BC to about 690 AD, passing through the Vandal Kingdom and Roman Empire into late antiquity. Emperor Augustus established there a colony of his veterans and the city started to grow soon in