Stoa of Eumenes

The Stoa of Eumenes was a Hellenistic colonnade built on the South slope of the Acropolis, Athens and which lay between the Theater of Dionysus and the Odeon of Herodes Atticus The gallery was donated to the city of Athens by the king of Pergamon, Eumenes II, around 160 BC. Vitruvius makes reference to the building when speaking about the purpose of stoai erected near theatres that served as a refuge for the spectators in inclement weather conditions or as stores for theatre props.

Source: Wikipedia