plans to build houses within sight of the fort, and because a remarkable artifact was discovered near the fort's main entrance.
was constructed in the early Iron Age, perhaps around 600 BCE. At first it had a double earthwork, but not long before the Romans arrived two more ditches and banks were added. The interior has never been systematically excavated, but the characteristic marks left by Iron Age round houses are visible. (Reconstruction by Ivan Lapper for English Heritage.)