The two most impartant ancient historians who wrote about the Second Punic War were Polybius (a Greek) and Livy (a Roman).
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The Punic Wars had no self or selves.
Carthage
The reason for the Punic Wars was competing interests and Romans expansion, which was eyeing Sicily, which had territory in Carthage. Punic was the Latin name for the Carthaginians. The Punic Wars were a series of 3 wars fought between Rome and city-state from 264 before Christ to 146 before Christ.
The wars that established ancient Rome as the major power in the western Mediterranean were the three Punic wars fought against Carthage.
People discovered the Punic wars from literature handed down to us from the ancients and the medieval scholars. Today we learn about them by studying history or just reading the translations of the ancient writers.