The Bouleuterion where the buildings in which the legislative assemblies of the Ancient Greek city states gathered.
It was the duty of these assemblies to decide on the important topic pertaining to everyday life such as setting the prices for trade goods.
When travelers start their private ephesus tours from the Upper entrance being accompanied by their professional certified private ephesus tour guide, the first structure taking their attention is the Bouleuterion, most of the people reckon that this is the Great Theater, but actually it is not.
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It is 12 times smaller than the Actual Great theater of Ephesus.
And after seeing Ephesus city, driving up to House of Virgin Mary, while and coming down from that road again, a great panoramic view of Ephesus Ancient city is standing right in front of travelers, from a distance of 400 yards, the Odeion still makes itself look like it's the Theater again.
Because of the scaling technique the ratio of the structure to the Hillside behind it is the same ratio of the Theater and the hill that it lays itself out. This is why the Bouleuterion were built near the Agora and the government buildings.
With the increased centralization of power during the imperial period, the Bouleuterion lost their earlier preeminence and many of them were converted into theaters or concert halls known as Odeion.
The Odeion you see now, built by one of the most eminent families of Ephesus had a capacity of 1800 people and had roof that protected the audience from the rain and the sun.