http://agathe.gr/guide/boundary_stones_and_house_of_simon_the_cobbler.html
Boundary Stones and House of Simon the Cobbler Inscribed marble posts were used to mark the entrances to the Agora wherever a street led into the open square. Two have been found in situ, inscribed with ... Boundary Stones and House of Simon the Cobbler Inscribed marble posts were used to mark the entrances to the Agora wherever a street led into the open square. ... Agora boundary stone found east of the Tholos, ca. 500 B.C. ... Agora boundary stone found deep under the Middle Stoa.