That, along with their perceived imperious manner, picked up after having lived much of their lives at the very heart of Roman imperial power, often offended Herod. They also attracted the jealousy of their older half-brother, Antipater II, who deftly incited the aging king's anger with rumors of his favored sons' disloyalty. After many failed attempts at reconciliation between the king and his designated heirs, the ailing Herod had Aristobulus and Alexander strangled on charges of treason in 7 BC, and raised Antipater to the rank of his co-regent and heir apparent.