Survey and excavation between 1988 and 1991 have revealed new evidence for the form, date, and history of the Roman stoa at Sparta. Nearly 200 m long, it was double-fronted and colonnaded, finished in marble, with two storeys on the S side and perhaps a single portico to the N, set either side of a central row of brick-faced concrete compartments that helped consolidate the acropolis plateau. Its order may have been archaizing Doric; it may have represented a reconstructed version of the Persian stoa. At the W end it buttressed the Round Building and its square podium. Evidence of the stratigraphy and architecture suggests it was built c. AD 130 and that the colonnades collapsed in the late 4th cent., after which it was partly incorporated into the late Roman wall circuit. The nearly central, cross-vaulted nymphaeum (bays XI–XII) was reused in the Middle Byzantine period for religious purposes, when a church was built nearby; possibly this was the church and monastery founded by St Nikon Metanoeites c.975. Occupation continued until c.1350. Interpretation of the topography of Sparta in the light of the new evidence from the stoa suggests that the still elusive agora may have been on the upper plateau N of the stoa, rather than beneath the stadium to the S.
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