Hierapolis. Turkey. View of the ancient Roman theatre, the best preserved monument in the ancient city. The theatre was built in two stages, during the times of Roman Emperors Hadrian and Septimius Severus during the 2nd and 3rd centuries AD. The upper and lower cavea has a total of 45 rows of seats which accommodated over 15000 spectators. Hierapolis was founded as a Hellenistic thermal spa city above the Pamukkale plateau in 190 BC by Eumenes II, King of Pergamum. The ancient city passed into the hands of the Romans where it grew and prospered especially during the second and third centuries AD. Most of the archaeological monuments at Hierapolis date from this period. Hierapolis-Pamukkale together are a Unesco World Heritage Site.