Aquae Calidae

Aquae Calidae (Latin for warm waters, Bulgarian: Акве Калиде), 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 on the Black Sea. 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 Tervel and the Ottoman sultan Suleiman the Magnificent. Aquae Calidae is shown on the Tabula Peutingeriana (edition of Konrad Miller, 1887), an illustrated itinerarium (ancient Roman road map) showing the layout of the road network of the Roman Empire.