(M538) Five hundred years before Christ the most powerful Grecian cities in Sicily were Agrigentum and Gela, on the south side of the island. The former, within a few years of its foundation, B.C. 570, fell under the dominion of one of its rich citizens, Phalasaris, who proved a cruel despot, but after a reign of sixteen years he was killed in an insurrection, and an oligarchal government was established, such as then existed in most of the Grecian cities. Syracuse was governed in this way by the descendants of the original settlers. Gela was, on the other hand, ruled by a despot called Gelo, the most powerful man on the island. He got possession of Syracuse, B.C. 485, and transferred the seat of his power to this city, by bringing thither the leading people and making slaves of the rest. Under Gelo Syracuse became the first city on the island, to which other towns were tributary. When the Greeks confederated against Xerxes, they sent to solicit his aid as the imperial leader of Sicily, and he could command, according to Herodotus, twenty thousand hoplites, two hundred triremes, two thousand cavalry, two thousand archers, and two thousand light-armed horse. So great was then the power of this despot, who now sought to expel the Carthaginians and unite all the Hellenic colonies in Sicily under his sway. But the aid was not given, probably on account of a Carthaginian invasion simultaneous with the expedition of the Persian king. The Carthaginians, according to the historian, arrived at Panormus B.C. 480, with a fleet of three thousand ships and a land force of three hundred thousand men, besides chariots and horses, under Hamilcar—a mercenary army, composed of various African nations. Gelo marched against him with fifty thousand foot and five thousand horse, and gained a complete victory, so that one hundred and fifty thousand, on the side of the Carthaginians, were slain, together with their general. The number of the combatants is doubtless exaggerated, but we may believe that the force was very great. Gelo was now supreme in Sicily, and the victory of Himera, which he had gained, enabled him to distribute a large body of prisoners, as slaves, in all the Grecian colonies. It appears that he was much respected, but he died shortly after his victory, leaving an infant son to the guardianship of two of his brothers, Polyzelus and Hiero, who became the supreme governors of the island. A victory gained by Hiero over the tyrant of Agrigentum gave him the same supremacy which Gelo had enjoyed. On his death, B.C. 467, the succession was disputed between his brother, Thrasybulus, and his nephew, the son of Gelo; but Thrasybulus contrived to make away with his nephew, and reigned alone, cruelly and despotically, until a revolution took place, which resulted in his expulsion and the fall of the Gelonian dynasty. Popular governments were now established in all the Sicilian cities, but these were distracted by disputes and confusions.