Although Lysimachus and Pyrrhus had cooperated in driving Antigonus Gonatas from Thessaly and Athens, in the wake of Demetrius's capture they soon fell out, with Lysimachus driving Pyrrhus from his share of Macedon.
Soon Lysimachus made the fatal mistake of having his son Agathocles murdered at the say-so of his second wife, Arsinoe (282 BC).