Odeon is the name for a public Ancient Greek or Roman building built for musical and poetry shows and competitions.
The word “odeon” comes from Ancient Greek, and means “singing place" or “building for musical competitions". The first Odeon was built in Ancient Sparta around 600 BC.
A total of three Ancient (Roman) Odeons have been discovered in Bulgaria so far – in Philipopolis (Plovdiv), Serdica (Sofia), and Nicopolis ad Istrum in Northern Bulgaria.
It is believed that the Plovdiv Odeon was first used as a bouleuterion, a building for the council of citizens (boule) in ancient city-states (poleis) but was later used as a space for theatrical performances.