After a campaign of three years' duration Alexander returned to Jerusalem, where he was received with the honors due to a conqueror. He had caused his crimes in part to be forgiven. In the very center of the kingdom, on a mount near the Jordan, he built a strong fortress, called after him, ALEXANDRION; and in the neighborhood of the Dead Sea, upon a towering height, protected on all sides by deep ravines, he raised the citadel of Machærus, the formidable guardian of his trans-Jordanic conquests. These two mountain fortresses, together with the third, Hyrcanion, built by John Hyrcanus, on Middle Mountain, were so amply fortified by nature and by art that they were considered impregnable. Even in the last years of Alexander's reign, although he was suffering from an intermittent fever, he undertook the siege of some of the yet unconquered fortresses of the trans-Jordanic territory. During the siege of Argob, however, he was seized with so severe an attack that he was forced to prepare himself for death. The solemnity of his last hours led him to look upon his former actions in a new light. He was horror-stricken to think how cruelly and foolishly he had persecuted the Pharisees, and how in consequence he had alienated himself from his people. He earnestly enjoined upon his queen, whom he declared regent, to connect herself closely with the Pharisees, to surround herself with counselors from their ranks, and not to embark in any undertaking without having their consent. He also impressed upon her to keep his death secret from his army until the beleaguered fortress should have fallen, and then to resign his body to the Pharisees, that they might either vent their rage upon it or else generously inter it. From an obscure but more authentic source we gather that Alexander sought to allay the queen's anxiety with regard to the party strife rampant in Jerusalem by the following words: "Do not fear either the true Pharisees or their honest opponents, but be on your guard against hypocrites of both sides (the counterfeit ones), who, when they commit sins, like the dissolute Prince Zimri, expect to be rewarded like Phineas, who was zealous for the Law." Alexander died in the forty-ninth year of his life and the twenty-seventh of his reign (79), and left two sons, Hyrcanus and Aristobulus. The Pharisees ungenerously appointed the anniversary of his death as a day of rejoicing.