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Who adopted Marcus Aurelius as his heir?

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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.

Marcus Aurelius was adopted by Antoninus Pius in 138 CE.

This arrangement was orchestrated by the emperor Hadrian, who required that Antoninus Pius adopt both Marcus Aurelius and the son of Lucius Aelius as his sons to ensure the imperial succession.12