 At a gathering after the marriage, Philip failed to defend Alexander's claim to the Macedonian throne when Attalus threatened his legitimacy, causing great tensions between Philip, Olympias, and Alexander.Olympias went into voluntary exile in Epirus along with Alexander, staying at the Molossian court of her brother Alexander I, who was the king at the time.In 336 BC, Philip cemented his ties to Alexander I of Epirus by offering him the hand of his and Olympias' daughter Cleopatra in marriage, a fact that led Olympias to further isolation as she could no longer count on her brother's support.