Periclean Fortification
In Pericles’ time in the 5th cent. BC the enclosure wall of the Sanctuary was extended to the east and south, beyond the contour of the Peisistratean enclosure of the 6th cent. BC. The Periclean wall, as this part is called, is built in the isodomic system, of eleusinian limestone blocks roughly worked in the lower section and poros in the superstructure, with perfectly finished outer face. It is about 4m wide, since it also functioned as retaining wall for the enlarged east court of the Telesterion. To the north and south it terminates in two circular towers, of which the northern one is preserved to the height of many courses of blocks.
Attached to the outer side of the Periclean Fortification is a complex of fountains that was constructed in Roman times.
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