It was first build about the year 150 BC by Attallus II, king of Pergamon.
The Stoa of Attalos was discovered during the excavations carried out by the Greek Archaeological Society between 1859 and 1902.

In 1953-56 it was reconstructed in order to house the finds from the excavations at the Agora.

The 16th of April 2003, here took place the accession treaty signing ceremony of the ten new European Union Member States.

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