Marcus Aurelius, as Caesar, 139-161. Sestertius (Orichalcum, 29mm, 21.34 g), Rome, 145. AVRELIVS CAESAR AVG PII F COS II Bare-headed bust of Marcus Aurelius to right, with slight drapery on his left shoulder. Rev. S - C Minerva standing right, brandishing spear in her right hand and holding shield in her left.