The name is Thracian and means "spring city", referring to the hot springs there. The earliest preserved mention of the city is in a list of 135 Roman Municipia in Thrace from 106 C.E.
The city's name originates from the Thracian tongue, meaning "spring city" due to its natural hot springs. The earliest recorded mention of this city can be found in a list of 135 Roman Municipalities in Thrace compiled around 106 C.E.