 Complete the following phrase:  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 Romes 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 