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 ... Agora boundary stone found east of the Tholos, ca. 500 B.C. ... Agora boundary stone found deep under the Middle Stoa. ... One such building, found just behind the northern boundary stone (horos, in Greek), produced bone eyelets and iron hobnails, suggesting that a cobbler worked here in the 5th century B.C., while a fragmentary drinking cup found nearby preserved the incised name of Simon (Figs. 25, 26).