The Social War' was fought between Rome and the socii in 91–88 B.C. over the issue of Roman citizenship. Various peoples who had treaties with Rome, often giving Rome power, were called socii. While Roman citizenships had legal rights, the socii had no such privilages. This resulted in resentment that boiled over in 91 B.C. when Marcus Livius Drusus proposed a law granting them citizenship. He was murdered in October that year and the socii across southern and central Italy rose in rebellion.
- Le Glay, Marcel; Voisin, Jean-Louis; Le Bohec, Yann; Cherry, David & Kyle, Donald (2006). A History of Rome, 3rd edition. Blackwell Publishing. pp. 115–116. ISBN 1-4051-1083-X.