 Macrinus was among his staff, as were other members of the Praetorian Guard.In April, Caracalla went to visit a temple of Luna near the site of the battle of Carrhae and was accompanied only by his personal guard, which included Macrinus.On April 8, while traveling to the temple, Caracalla was stabbed to death by Justin Martialis, a soldier whom Macrinus had recruited to commit the murder.