After the defeat at Battle of Actium, Octavian invaded Egypt in 30 BC. Antyllus was involved in one of three unsuccessful emissaries to Octavian. His father sent him to Octavian with a large sum of money, in exchange for peace. Octavian kept the money, but dismissed Antyllus and returned him to his father. After losing further battles, Antony committed suicide and Cleopatra soon followed him. Not so long after the deaths of his father and stepmother, Antyllus' tutor Theodorus betrayed him to Octavian. Pleading in vain for mercy from Octavian, Antyllus was dragged from the image of the now deified Julius Caesar by Roman soldiers. Octavian ordered his execution on the same day as that of Caesarion. After Antyllus was beheaded, Theodorus took a precious stone that the young man had worn on a chain around his neck and sewed the stone into his belt. Although Theodorus denied the theft, Octavian tried him, found him guilty, and ordered his crucifixion.