The Theatre of Dionysus (or Theatre of Dionysos, ) is an ancient Greek theatre in Athens. It is built on the south slope of the Acropolis hill, originally part of the sanctuary of Dionysus Eleuthereus (Dionysus the Liberator). The first orchestra terrace was constructed on the site around the 4th and 5th century BC, where it hosted the City Dionysia. The theatre reached its fullest extent in the fourth century BC under the epistates of Lycurgus when it would have had a capacity of up to 25,000, and was in continuous use down to the Roman period. The theatre then fell into decay in the Byzantine era and was not identified, excavated and restored to its current condition until the nineteenth century. Sanctuary and first theatre The cult of Dionysus was introduced to Attica in the Archaic period with the earliest representation of the God dating to c. 580 BC. The City Dionysia (or Great Dionysia) began sometime in the Peisistratid era. and was reorganised during the Kleisthenic reforms of the 520s BC. The first dramatic performances likely took place in the Agora where it is recorded that the wooden bleachers set up for the plays (ikria) collapsed. This disaster perhaps prompted the removal of dramatic production to the Sanctuary of Dionysus on the Akropolis, which took place by the time of the 70th Olympiad in 499/496 BC. At the temenos the earliest structures were the Older Temple, which housed the xoanon of Dionysos, a retaining wall to the north and slightly further up the hill a circular terrace that would have been the first orchestra of the theatre. The excavations by Wilhelm Dörpfeld identified the foundations of this terrace as a section of polygonal masonry, indicating an archaic date. It is probable there was an altar, or thymele, in the centre of the orchestra. No formally constructed stone seating existed at this point, only ikria and the natural amphitheatre of the hill served as theatron. Besides the archaeological evidence, there is the literary testimonia of the contemporary plays from which there are clues as to the theatre’s construction and scenography. For this earliest phase of the theatre there is the work of Aeschylus, who flourished in the 480-460s. The dramatic action of the plays does point to the presence of a skene or background scenery of some description, the strongest evidence of which is from the Oresteia that requires