The Odeon of Philippopolis (Bulgarian: Одеон на Филипополис) was the house of the city council of citizens (known as bouleuterion) of ancient Plovdiv. It was also used as a theatre due to its appropriate structure. The Odeon buildings had four construction periods: from the 2nd century AD (during the reign of Hadrian) when it was initially built to the 4th century AD when it was abandoned. The existence of such a building in ancient Plovdiv is a sign for the importance of Philippopolis as a cultural and political centre.