Aristobulus II, who had attained royal dignity by a successful stroke of arms, does not appear to have in any way excited the displeasure of the Pharisees. The position of the two parties in Judæa now assumed a different character, and they might have become extinct as parties, had it not been for the advent of a man whose measureless ambition and personal interest brought him to the fore, and who, together with his family, became the vampire of the nation, sucking its noblest blood away. This man was Antipater, the descendant of a distinguished Idumæan family, who, in common with all other Idumæans, had been compelled by John Hyrcanus to accept Judaism. Never had a mistaken action found its punishment more surely and swiftly. The fanaticism of Hyrcanus I was now to bring ruin upon his house and family. The wealth and diplomatic talents of Antipater had raised him to the post of satrap of Idumæa during the reign of Alexander Jannæus and of his queen. His courteous acts and generous presents had won the affections not only of his countrymen, but also those of the inhabitants of Gaza and Ascalon.
Hyrcanus II, who required a guide in his helplessness, bestowed his confidence upon Antipater, who abused it, and exerted his influence to his own advantage. The Idumæan lost no opportunity of reminding Hyrcanus of the degrading part that he had had to play in having been called to the throne only to relinquish it to his younger brother. So successfully did Antipater work upon his feelings, making him believe that Aristobulus was actually planning his death, that Hyrcanus was tempted into breaking the covenant he had sworn to respect, by calling in a foreign ruler to decide between the claims of the two brothers. Antipater had laid his plans beforehand with Aretas, king of the Nabathæans. He fled one night from Jerusalem, bearing Hyrcanus with him, and arrived by forced marches at Petra, the capital of the Nabathæan king. Aretas was ready to help Hyrcanus, having been richly bribed by Antipater, and having the prospect of recapturing twelve cities east and south of the Dead Sea, which had been bought so dearly by the Hasmonæans. He marched, therefore, upon Judæa, with an army of fifty thousand men, whose numbers were augmented by the followers of Hyrcanus (66). Thus the peace which the nation had enjoyed for nearly three years was disturbed for many a long day by the scheming ambition of Antipater and the boundless folly of Hyrcanus.