Ptolemy Keraunos
The union between Arsinoe II and Ptolemy Keraunos was purely political as they both claimed the Macedonian, Thracian thrones and by the time of Ptolemy father's death his power extended to southern Greece. Arsinoe II's marriage to her half-brother wasn't a happy one. Through his marriage to Arsinoe II, Ptolemy Keraunos’ political position would be strengthened. As Ptolemy's uncle-stepfather was becoming too powerful, Arsinoe II conspired with her sons against him, while he was away on a campaign. Ptolemy Keraunos quickly retaliated by capturing Cassandreia and killing Ptolemy's brothers Lysimachus and Philip. Arsinoe II and Ptolemy were able to escape.