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In page Elefsina:

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The Telesterion, or temple of Demeter, was the largest in all Greece,[citation needed] and is described by Strabo as capable of containing as many persons as a theatre.[1] The building was initially designed by Ictinus, the architect of the Parthenon at Athens; but it was many years before it was completed, and the names of several architects are preserved who were employed in building it.