Thus it was by blended art and heroism that the Roman legions prevailed over the armies of the ancient world. But this military power was not gained in a say; it took nearly two hundred years, after the expulsion of the kings, to regain supremacy over the neighboring people, and another century to conquer Italy. The Romans did not contend with regular armies until they were brought in conflict with the king of Epirus and the phalanx of the Greeks, "which improved their military tactics, and introduced between the combatants those mutual regards of civilized nations which teach men to honor their adversaries, to spare the vanquished, and to lay aside wrath when the struggle is ended." After the consolidation of Roman power in Italy, it took but one hundred and fifty years more to complete the conquest of the world,--of Northern Africa, Spain, Gaul, Illyria, Epirus, Greece, Macedonia, Asia Minor, Pontus, Syria, Egypt, Bithynia, Cappadocia, Pergamus, and the islands of the Mediterranean. The conquest of Carthage left Rome without a rival in the Mediterranean, and promoted intercourse with the Greeks. The Illyrian wars opened to the Romans the road to Greece and Asia, and destroyed the pirates of the Adriatic. The invasion of Cisalpine Gaul, now that part of Italy which is north of the Apennines, protected Italy from the invasion of barbarians. The Macedonian War against Philip put Greece under the protection of Rome, and that against Antiochus laid Syria at her mercy; when these kingdoms were reduced to provinces, the way was opened to further conquests in the East, and the Mediterranean became a Roman lake.