In 264 BC, a group of Campanian mercenaries known as the Mamertines seized control of Messina. They killed and exiled the men of the city while holding the women in bondage. The Syracusan general Hiero advanced on the city to restore order. Carthage offered aid to the Mamertines to prevent any single power from dominating Sicily. The Mamertines expelled the Carthaginian garrison and asked Rome for help. A debate erupted at Rome about whether to intervene against Carthage. Some historians claimed a treaty existed assigning Sicily to Carthaginian influence. Polybius denied this treaty's existence but noted economic motivations drove Roman intervention. The Senate allowed the popular assembly to decide on sending aid. This decision marked the beginning of the First Punic War without an official declaration of war.
Grain And Governance
Rome established a provincial structure with a praetor and two quaestores based at Lilybaeum and Syracuse. In 227 BC, Gaius Flaminius was sent to Sicily as one of the first praetores provinciales. An annual grain tribute called the lex frumentaria imposed a tenth of the harvest on communities. Contractors known as decumani bid to collect these taxes. The system derived possibly from the Syracusan kingdom under King Hiero II. Small Italian proprietors lived on the island and faced varying levels of taxation depending on their status. Four legal classes divided the cities into foederatae civitates, civitates sine foedere immunes ac liberae, civitates decumanae, and civitates censoriae. Most cities paid the decuma tax while others enjoyed exemptions for loyalty during the Punic Wars. Syracuse became the capital in 212 BC after its conquest by Marcellus.