Alexander III., King of Macedonia, surnamed the Great, was born at Pella in the year 356 B.C. He was the son of Philip II. and Olympias, who belonged to the royal race of Epeiros, which claimed to be descended from Achilles, the hero of the _Iliad_. The education of the prince was in the outset entrusted to Lysimachos, an Akarnanian, and to his mother’s kinsman Leonidas, a man of an austere character, who inured his pupil to Spartan-like habits of hard exercise and simple fare. In his thirteenth year he was placed under the immediate tuition of Aristotle, who acquired a life-long influence over the mind and character of his pupil. It may be supposed that the eager love of discovery which conspicuously distinguished Alexander from ordinary conquerors was in a great measure inspired and stimulated by the precepts of his master. In his sixteenth year he was entrusted, during his father’s absence on a foreign expedition, with the regency of Macedonia; and two years later, at the battle of Chaironeia, which was won chiefly through his impetuous valour, he displayed for the first time his incomparable genius for war. This victory made the Macedonian King supreme in Greece, and at a convention which met soon afterwards at his summons, and which was attended by deputies from all the Grecian states except Sparta, he was appointed to command the national forces and to conduct an expedition against Persia to avenge the invasions of Mardonios and Xerxes. He was actively engaged in preparing for this great contest when he fell by the hand of an assassin. Alexander succeeded (336 B.C.) not only to his sovereignty, but also to his supremacy in the affairs of Greece. He found himself, immediately on his accession, beset on all sides with most formidable opponents. Attalos, who was in Asia with a considerable force under his command, aspired to the throne; the Greeks, instigated by the passionate eloquence of Demosthenes, attempted to liberate themselves from Macedonian dictation, and the barbarians of the north threatened his hereditary dominions with invasion. The youthful monarch was equal to the emergency. He at once seized Attalos and put him to death. Then suddenly marching southwards, he suppressed by skilful diplomacy the incipient rebellion of the Greek states. In the next place he turned his arms northwards, and, after much severe fighting, subjugated the barbarous tribes which lay between the frontiers of his kingdom and the Danube. Finally, he quelled in blood and desolation the revolt of Thebes, which had been prompted by a false rumour of his death. Having thus in a single year made himself a more powerful monarch than his father had ever been, he directed all his energies to complete the arrangements for the Persian expedition. The whole force which he collected for this purpose amounted to little more than 30,000 foot and 4500 horse.