Philip understood the Greek people thoroughly. He had received his early training among them while a hostage at Thebes. He found in their petty feuds, in their indolence and corruptibility, his opportunity to carry into effect his matured plans of conquest. His energy never slept; his influence was ever present. When he was far away, extending his boundaries among the barbarians, his money was still active in Athens and elsewhere. His agents, often among the ablest men in a community, were busy using every cunning means at the command of the wonderful Greek ingenuity to conceal the danger or to reconcile the fickle people to a change that promised fine rewards for the sale of their liberty. Then he began to trim off one by one the outlying colonies and dependencies of the Greek States. His next step was to be the obtaining of a foothold in Greece proper. The chief obstacle to Philip's progress was Athens, degenerate as she was, and his chief opponent in Athens was Demosthenes. This Philip understood very well; but he treated both the city and the great statesman always with a remarkable leniency. More than once Athens, inflamed by Demosthenes, flashed into her old-time energy and activity, and stayed the Macedonian's course; as when, in his first bold march towards the heart of Greece, he found himself confronted at Thermopylae by Athenian troops; and again when prompt succor from Athens saved Byzantium for the time. But the emergency once past, the ardor of the Athenians died down as quickly as it had flamed up. The Social War (357-355 B.C.) left Athens stripped almost bare of allies, and was practically a victory for Philip. The Sacred War (357-346 B.C.) between Thebes and Phocis, turning upon an affront offered to the Delphian god, gave Philip the eagerly sought-for opportunity of interfering in the internal affairs of Greece. He became the successful champion of the god, and received as his reward a place in the great Amphictyonic Council. He thus secured recognition of his claims to being a Greek, since none but Greeks might sit in this council. He had, moreover, in crushing the Phocians, destroyed a formidable power of resistance to his plans. Such were the times and such the conditions in which Demosthenes entered upon his strenuous public life. He was born most probably in 384 B.C., though some authorities give preference to 382 B.C. as the year of his birth. He was the son of Demosthenes and Cleobule. His father was a respectable and wealthy Athenian citizen, a manufacturer of cutlery and upholstering. His mother was the daughter of Gylon, an Athenian citizen resident in the region of the Crimea.