Greece, and above all Epirus, sacked by Paulus Æmilius, underwent the penalty of defection. As to the Achæan league, the fidelity of which had appeared doubtful, nearly a thousand of the principal citizens, guilty or suspected of having favoured the Macedonians, were sent as hostages to Rome.[582] [Sidenote: Modification of Roman policy.] XI. In carrying her victorious arms through almost all the borders of the Mediterranean, the Republic had hitherto obeyed either legitimate needs or generous inspirations. Care for her future greatness, for her existence even, made it absolute on her to dispute the empire of the sea with Carthage. Hence the wars, of which Sicily, Sardinia, Spain, Italy, and Africa, by turns, became the theatre. It was also her duty to combat the warlike peoples of the Cisalpine, that she might ensure the safety of her frontiers. As to the expeditions of Macedonia and Asia, Rome had been drawn into them by the conduct of foreign kings, their violation of treaties, their guilty plottings, and their attacks on her allies. To conquer thus became to her an obligation, under pain of seeing fall to ruin the edifice which she had built up at the price of so many sacrifices; and, what is remarkable, she showed herself after victory magnificent towards her allies, clement to the vanquished, and moderate in her pretensions. Leaving to the kings all the glory of the throne, and to the nations their laws and liberties, she had reduced to Roman provinces only a part of Spain, Sicily, Sardinia, and Cisalpine Gaul. In Sicily she preserved the most intimate alliance with Hiero, tyrant of Syracuse, for fifty years. The constant support of this prince must have shown the Senate how much such alliances were preferable to direct dominion. In Spain she augmented the territory of all the chiefs who consented to become her allies. After the battle of Cynoscephalæ, as after that of Magnesia, she maintained on their thrones Philip and Antiochus, and imposed on this last only the same conditions as those offered before the victory. If, after the battle of Pydna, she overthrew Perseus, it was because he had openly violated his engagements; but she gave equitable laws to Macedonia. Justice then ruled her conduct, even towards her oldest rival; for when Masinissa asked the help of the Senate in his quarrels with Carthage, he received for answer that, even in his favour, justice could not be sacrificed.[583]