The Hellenic league, which included all the Greek states south of Thermopylæ and all the islands which had once owned the supremacy of Athens, met again at Corinth and renewed with Alexander the same agreement that had previously been made with his father, a treaty of offensive and defensive alliance, and the chief command by land and sea was assigned to the new king, as his father’s successor. After this triumphal and peaceful progress, Alexander returned home, where his barbarian neighbors were giving trouble by revolts against his authority. In order to bring himself in contact with the Greek opposition to Alexander, Attalus, one of the two commanders of the Macedonian army in Asia, had entered into relations with Demosthenes, only a short time after Alexander’s succession. As Cleopatra’s uncle he took a leading part in engineering a conspiracy intended to supplant Alexander by Amyntas, the young son of Perdikkas, the elder brother of Philip, who by the traditional usage of the Macedonian monarchy was entitled to succeed Philip. The success of Alexander in Greece convinced Attalus of the futility of his schemes, and he therefore tried to make advances to the young ruler. But Alexander was not to be placated, and, as a deviser of conspiracies in his own interest, he showed that he had nothing to learn from the practised hands of the Macedonian nobles. It would have been extremely unwise for Alexander to have shown himself openly an enemy of Attalus, who enjoyed much popularity in the army. Accordingly he made a show of friendship by graciously accepting the advances of Attalus, and at the same time he despatched an associate, Hekatæus, on whom he could rely, with directions to assassinate him. The treacherous deed was made the easier, because Parmenio, joint-commander with Attalus in Asia Minor, facilitated the plans of the assassination, despite the fact that Attalus was married to his daughter. The tribal interests of a half-barbarous people had full sway among the Macedonians, so Parmenio, who had throughout his life been conscientiously loyal to the Macedonian monarchy, did not scruple to sacrifice his daughter’s husband, when it appeared that his son-in-law was plotting to supplant the regularly accepted monarch of his people.