Rectangular building near the Prytaneion. As testified by inscriptions,
its foundation dates back to early 3rd century BC.
The building was restored for the first time in 219 BC after
its initial destruction during the invasion of the Aetolians, and for a second time
after the invasion of the Romans in 167 BC. Behind the colonnaded
portico which formed the facade, two entrances led directly to the auditorium.
Its southern part was occupied by seats, delegating the six ionic columns which supported the roof
of the auditorium to the northern half of the room.
Narrow stairways at the sides led to the upper tiers.
Today only the foundation, an interior column in the southwestern part of the
room, an altar and a statue base are preserved.