Limestone step block from the Propylon of the "Heliaia" (now identified as the Aiakeion) and reused in the "Contractor's Wall" to the west of the Middle Stoa ... 4160 Horizontal (normal) ... 26 Aug 1961 ... Limestone step block from the Propylon of the "Heliaia" (now identified as the Aiakeion) and reused in the "Contractor's Wall" to the west of the Middle Stoa.