It happened, however, that the necessary evidence against Gelon was furnished without a resort to this measure; for when Gelon reported to Neoptolemus that Myrtilus had acceded to his proposal to join him in a plan for removing Pyrrhus out of the way, Neoptolemus was so much overjoyed at the prospect of recovering the throne to his own family again, that he could not refrain from revealing the plan to certain members of the family, and, among others, to his sister Cadmia. At the time when he thus discovered the design to Cadmia, he supposed that nobody was within hearing. The conversation took place in an apartment where he had been supping with Cadmia, and it happened that there was a servant-woman lying upon a couch in the corner of the room at the time, with her face to the wall, apparently asleep. She was, in reality, not asleep, and she overheard all the conversation. She lay still, however, and did not speak a word; but the next day she went to Antigone, the wife of Pyrrhus, and communicated to her all that she had heard. Pyrrhus now considered the evidence that Neoptolemus was plotting his destruction as complete, and he determined to take decisive measures to prevent it. He accordingly invited Neoptolemus to a banquet. Neoptolemus, suspecting nothing, came, and Pyrrhus slew him at the table. Henceforward Pyrrhus reigned in Epirus alone. Pyrrhus was now about twenty-three years of age, and inasmuch as, with all his moderation in respect to the pursuit of youthful pleasures, he was of a very ambitious and aspiring disposition, he began to form schemes and plans for the enlargement of his power. An opportunity was soon afforded him to enter upon a military career. Cassander, who had made himself King of Macedon in the manner already described, died about the time that Pyrrhus established himself on his throne in Epirus. He left two sons, Alexander and Antipater. These brothers immediately quarreled, each claiming the inheritance of their father's crown. Antipater proved to be the strongest in the struggle; and Alexander, finding that he could not stand his ground against his brother without aid, sent messengers at the same time to Pyrrhus, and also to Demetrius, in Thessaly, calling upon both to come to his assistance. They both determined to do so. Demetrius, however, was engaged in some enterprises which detained him for a time, but Pyrrhus immediately put himself at the head of his army, and prepared to cross the frontier.