It was a gift to the people of Athens by Marcus Vipsanius Agrippa, a Roman statesman and general.
[1] The two-story auditorium seated around 1,000 spectators and was equipped with a raised stage and marble-paved orchestra.
The main entrance for spectators was originally on the south side of the building, with access from the terrace of the Middle Stoa.
The Odeon was rebuilt as a smaller lecture hall, seating only 500, and a more elaborate facade was added to the north side.
A sprawling palace was built on the site in the early 5th century AD with the pillars of the northern facade being used to create a monumental entrance.