Battle of Actium
In 31 BC, after Antony's defeat at the Battle of Actium, Cleopatra had Artavasdes decapitated. He had been an enemy of his namesake, King Artavasdes I of Media Atropatene, an ally of Antony and Cleopatra. She sent his head to Artavasdes I of Media Atropatene to secure his help.