Adjacent to the Prytaneion is Odeon Theatre. The primary purpose of the semi-circular structure was a bouleuterion. This is Greek for an assembly hall for city council members or legislators (boule). The facility doubled as an odeum, meaning a venue for concerts. These performances were on an intimate scale compared to the Great Theatre. Odeon Theatre was shielded by a wooden roof when built in 144 AD. The arched passage is a vomitorium. The name stems from vomit, the Greek word for mouth. Construction of Odeon Theatre was financed by local philanthropist Publius Vedius Antoninus. The theatre was shattered during a large earthquake in 614 AD.