Velleius Paterculus, History of Rome 2.16.4
“Gradually, then, by granting citizenship to those who had not carried arms or had put them down rather late, the population was rebuilt as Pompeius, Sulla and Marius restored the flagging and sputtering power of the Roman people.”
Paulatim deinde recipiendo in civitatem, qui arma aut non ceperant aut deposuerant maturius, vires refectae sunt, Pompeio Sullaque et Mano fluentem procumbentemque rem populi Romani restituentibus.
Any student of Roman history understands that Rome’s expansion and strength relied in part on its ability to absorb and assimilate hostile populations. Today we often forget that the Italian peninsula was far from a uniform culture. (And a tour through modern Italy will confirm the persistence of many differences). The process, of course, was not without pain and hard compromises, as Vergil echoes in Aeneid 6 during Anchises’ prophecy to Aeneas (851-3):
tu regere imperio populos, Romane, memento
(hae tibi erunt artes), pacique imponere morem,
parcere subiectis et debellare superbos.
“Roman, remember that your arts are to rule
The nations with your empire, to enforce the custom of peace,
To spare the conquered and to subjugate the proud.”