Multi-Dimensional Ancient Boundary Stone Discovered In Rome A Roman Empire boundary stone has been discovered in Rome, and while thousands of similar stones exist across the empire, this one is being viewed with extra attention. While most Roman boundary stones say, “cross this line and you get chopped,” this one whispers complex stories of a young emperor flexing his power in a complex game of thrones world. In June this year, during excavations for a rerouted sewer beneath the mausoleum of Emperor Augustus, a rare “boundary stone” was discovered that used to mark ancient Rome's city limits. A PHYS article explains that the “monumental pomerial stone [a pomerium was religious boundary placed around Roman-controlled cities]” was created during the rule of Roman Emperor Claudio (Claudius) in 49 AD. The hewn boundary stone defined one extreme of the pomerium of Rome, which was the sacred boundary of “Urbe” (another name for Rome during the Roman Empire.)