Aquae Calidae, Bulgaria well as from Kabyle, Mesambria (now Nessebar), Odessos, Histria, Tomis, Byzantium, Abdera, Maroneia and the islands of the Aegean, the oldest from Apollonia Pontica from the 5th century BC. The first baths at the Sanctuary of the Three Nymphs originated when the Roman Empire under Lucullus conquered the region, during the Third Mithridatic War in 72 BC. Under Trajan (98-117) nearby Anchialos became the administrative centre of the region and the baths were expanded and extended with two more swimming pools. During this time the Via Pontica was built connecting Constantinople via Deultum, Anchialos, Aquae Calidae with Dorostorum and Sexaginta
Celsa (Roman city) the "scaenae frons" (stage) walls and tiers of seats ("cavea") have been found. Many small objects as lamps, Pompeian red slip dishes, Iberian ceramics, etc., as well as small bronzes, sculptural remains, coins and small pieces of jewellery are also preserved. A nearby museum displays many of the finds. Celsa (Roman city) Celsa was an important pre-Roman and Roman city located near the modern town of Velilla de Ebro. Recent excavations have brought to light many rich private and public buildings which give a glimpse of its former grandeur. Celsa was originally an Iberian settlement, called "Kelse", of the Ilergetes