The Servian reforms increased the number of tribes and expanded the city, which was protected by a new rampart, moat and wall. The enclosed area was divided into four administrative "regiones" (regions, or quarters); the Suburana, Esquilana, Collina and Palatina. Servius himself is said to have taken a new residence, on the Esquiline. The situation beyond the walls is unclear, but thereafter, membership of a Roman voting-tribe would have depended on residence rather than kinship, ancestry and inheritance. This would have brought significant numbers of urban and rural "plebs" into active political life; and a significant number of these would have been allocated to centuries of the first class, and therefore likely to vote. The city of Rome's division into "quarters" remained in use until 7 BC, when Augustus divided the city into 14 new "regiones". In modern Rome, an ancient portion of surviving wall is attributed to Servius, the remainder supposedly being rebuilt after the sack of Rome in 390/387 BC by the Gauls.