Being now about seventeen years old, and the government in appearance well settled, he took a journey out of the kingdom to attend the marriage of one of Glaucias's sons, with whom he was brought up; upon which opportunity the Molossians again rebelling, turned out all of his party, plundered his property, and gave themselves up to Neoptolemus. Pyrrhus having thus lost the kingdom, and being in want of all things, applied to Demetrius, the son of Antigonus, the husband of his sister Deidamia, who, while she was but a child, had been in name the wife of Alexander, son of Roxana, but their affairs afterwards proving unfortunate, when she came to age, Demetrius married her. At the great battle of Ipsus, where so many kings were engaged, Pyrrhus, taking part with Demetrius, though yet but a youth, routed those that encountered him, and highly signalized himself among all the soldiery; and afterwards, when Demetrius's fortunes were low, he did not forsake him then, but secured for him the cities of Greece with which he was intrusted;and upon articles of agreement being made between Demetrius and Ptolemy, he went over as an hostage for him into Egypt, where both in hunting and other exercises he gave Ptolemy an ample proof of his courage and strength. Here observing Berenice in greatest power, and of all Ptolemy's wives highest in esteem for virtue and understanding, he made his court principally to her. He had a particular art of gaining over the great to his own interest, as on the other hand he readily overlooked such as were below him; and being also well-behaved and temperate in his life, among all the young princes then at court he was thought most fit to have Antigone for his wife, one of the daughters of Berenice by Philip, before she married Ptolemy.
After this match, advancing in honour, and Antigone being a very good wife to him, having procured a sum of money, and raised an army, he so ordered matters as to be sent into his kingdom of Epirus, and arrived there to the great satisfaction of many, from their hate to Neoptolemus, who was governing in a violent and arbitrary way. But fearing lest Neoptolemus should enter into alliance with some neighbouring princes, he came to terms and friendship with him, agreeing that they should share the government between them.
There were people, however, who, as time went on, secretly exasperated them, and fomented jealousies between them. The cause chiefly moving Pyrrhus is said to have had this beginning. It was customary for the kings to offer sacrifice to Mars at Passaro, a place in the Molossian country, and that done to enter into a solemn covenant with the Epirots; they to govern according to law, these to preserve the government as by law established. This was performed in the presence of both kings, who were there with their immediate friends, giving and receiving many presents; here Gelo, one of the friends of Neoptolemus, taking Pyrrhus by the hand, presented him with two pair of draught oxen. Myrtilus, his cup-bearer, being then by, begged these of Pyrrhus, who not giving them to him, but to another, Myrtilus extremely resented it, which Gelo took notice of, and, inviting him to a banquet (amidst drinking and other excesses, as some relate, Myrtilus being then in the flower of his youth), he entered into discourse, persuading him to adhere to Neoptolemus, and destroy Pyrrhus by poison. Myrtilus received the design, appearing to approve and consent to it, but privately discovered it to Pyrrhus, by whose command he recommended Alexicrates, his chief cup-bearer, to Gelo, as a fit instrument for their design, Pyrrhus being very desirous to have proof of the plot by several evidences. So Gelo, being deceived, Neoptolemus, who was no less deceived, imagining the design went prosperously on, could not forbear, but in his joy spoke of it among his friends, and once at an entertainment at his sister Cadmea's talked openly of it, thinking none heard but themselves.
Nor was any one there but Phaenarete the wife of Samon, who had the care of Neoptolemus's flocks and herds. She, turning her face towards the wall upon a couch, seemed fast asleep, and having heard all that passed, unsuspected, next day came to Antigone, Pyrrhus's wife, and told her what she had heard Neoptolemus say to his sister.
On understanding which Pyrrhus for the present said little, but on a sacrifice day, making an invitation for Neoptolemus, killed him; being satisfied before that the great men of the Epirots were his friends, and that they were eager for him to rid himself of Neoptolemus, and not to content himself with a mere petty share of the government, but to follow his own natural vocation to great designs, and now when a just ground of suspicion appeared, to anticipate Neoptolemus by taking him off first.