Calleva, formally Calleva Atrebatum ("Calleva of the Atrebates"), was an Iron Age oppidum and subsequently a town in the Roman province of Britannia and the civitas capital of the Atrebates tribe. Its ruins are now known as Silchester Roman Town and are beneath and to the west of the Parish Church of St Mary the Virgin, which is just within the town wall and about 1 mile (1.6 km) to the east of the modern village of Silchester, in the English county of Hampshire close to the boundary with Berkshire. Reading is some 9 miles (14 km) north-east and Basingstoke is 5 miles (8.0 km) south.