How did Antoninus Pius prepare Marcus Aurelius to rule?

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Bronze equestrian statue of Marcus Aurelius with his right arm raised, seated on a horse, at Piazza del Campidoglio in Rome, Italy. — Marcus Aurelius Marcus Aurelius, bronze equestrian statue in the Piazza del Campidoglio, Rome.

Antoninus Pius prepared Marcus Aurelius for his future role as emperor by integrating him into the administrative and political life of the Roman Empire over a long apprenticeship.1

After adopting Marcus in 138, Antoninus Pius provided him with direct experience in governance by assigning him various public roles. Marcus served as consul in 140, 145, and 161. In 145, Marcus married the emperor’s daughter, Annia Galeria Faustina, further solidifying his position within the imperial family.1

By 147, Antoninus Pius conferred upon Marcus the imperium and tribunicia potestas—the essential formal powers of the emperorship. This transition effectively made Marcus a junior co-emperor, allowing him to participate in the intimate counsels and crucial decision-making processes of Antoninus’s reign. Throughout this period, Marcus balanced these official duties with his intellectual development, eventually finding spiritual and moral guidance in Stoic philosophy.1