Bouleuterion

[…]we print here an updated and revised list of bouleuteria, some attested only in written sources, some physically preserved.⁶³ In most cases, however, the identification of a building as a bouleuterion is uncertain.

The "Old Bouleuterion", whether it was built before or after the Persian sack of Athens,³ certainly antedates the New Bouleuterion.

The history of the bouleuterion as a distinct architectural form seems to begin in late Archaic Athens, where the first Bouleuterion was perhaps built soon after the constitutional reforms of Kleisthenes.