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Varna is among Europe's oldest cities. Miletians founded the trading colony of Odessos in 570 BCE at the site of an earlier Thracian settlement. In 339 BCE, the city was unsuccessfully besieged by Philip II but surrendered to Alexander the Great in 335 BC. The Roman city, Odessus (annexed in 15 CE to the province of Moesia, later Moesia Inferior), occupied 47 hectares in present-day central Varna and had prominent public baths, erected in the late 2nd century, now the largest Roman remains in Bulgaria (the building was 100 m wide, 70 m long, and 20 m high) and fourth largest known Roman baths in Europe. See Wikipedia.