Gaia inherited a pre-existing territory from his father Zelalsan, bordered to the East by Carthage and to the West by the kingdom of the Masaesyles, two major African powers of the time.. At the beginning of his reign around 240 BC, the First Punic War (264-241 BC) weakened Carthaginian power. Gaia took advantage of this to undertake the conquest of coastal cities controlled by Carthage. A skilled tactician with excellent cavalry, he defeated the Carthaginians and made Annaba (also known as Hippo Regius) his capital. Being a king attentive to the geopolitical developments of his time, Gaia forged a new alliance with the Carthaginians in 213/212 BC in response to the rise to power of
Syphax, his Masaesylian neighbor, who had recently entered into conflict with them. His foresight allowed him to seize the Punic cities along the Numidian coast. It was also from this period, and with the reversal of alliances, that the military career of his son Massinissa began, who would later write a new chapter in the history of the Berbers. == Legacy ==