The "skene" foundation was underpinned with limestone blocks in this period, the orchestra was reduced in size and refloored in varicoloured marble with a rhombus pattern in the centre. A marble barrier was erected in 61 AD or later, enclosing the "orchestra" up to the "parodoi". The object of this might have been to protect the audience during gladiatorial combats. The last phase of restoration was in the Hadrianic or Antonine era with the construction of the Bema of Phaidros, an addition to the Neronian high pulpitum stage. After the late 5th century AD the theatre was abandoned: its orchestra became an enclosed courtyard for a Christian basilica ("aithrion") which was built into the eastern parados, while its cavea served as a stone quarry. The basilica was subsequently destroyed and by the mid-eleventh century the Rizokastro wall crossed the bema and the parodos walls. Archaeological examination of the site began in earnest in the nineteenth century with the excavation of Rousopoulos in 1861. Subsequent major archaeological campaigns were Dörpfeld-Reisch, Broneer and Travlos. Evidence points to the enormous popularity of theatre in ancient Greek society. From competition for scarce seating, the expanding number of festivals and performances to theatre lovers touring the Rural Dionysia. It is also clear from fragments of audience reaction that have come down to us that the public were active participants in the dramatic performance, and that there was reciprocal communication between performers and spectators. It is possible, for example, that laws were enacted in the late fifth century to curtail comic outspokenness such was the offence taken by some of the views expressed on the stage. One anecdote that illustrates the fraught nature of this highly partisan audience reaction is that recorded by Plutarch who writes that in 468 BC when Sophocles was competing against Aeschylus there was so much clamour Kimon had to march his generals into the theatre to replace the judges and secure Sophocles’ victory. While ancient drama undoubtedly excited passion in contemporary spectators there remains the question of to what degree did they value or appreciate the work before them? Aristotle's "Poetics" remarks “[h]ence there is no need to adhere at all costs to the traditional stories, around which tragedies are constructed. For to try to do this would be ridiculous, since even the well-known materials well-known only to a few, but nevertheless delights all.”