http://agathe.gr/guide/bouleuterion.html
Bouleuterion Just uphill from the Tholos was the Bouleuterion, meeting place of the boule, or senate. Five hundred Athenian citizens were chosen by lot to serve for a year, and met in this building every ... The remains are in a miserable state of preservation, with only the outlines of walls discernible in trenches sunk into bedrock. The building dates to the last quarter of the 5th century B.C., replacing an earlier version dating to ca. 500 B.C.
