For 10 Points, name this adoptive brother of Lucius Verus and author of the Meditations, succeeded by his jackass son Commodus.
One letter from early in this man's life he relates how he, on horseback, dispersed a crowd of herdsmen and animals for the fun of it. Tutored in youth by the Homeric scholar Alexander of Cotiaeum and the Athenian millionaire Herodes Atticus, his mother was a major player in the Roman brickmaking industry named Domitia Lucilla. Under his rule Statius Priscus recovered Armenia, and Ctesiphon was sacked and Mesopotamia made a Roman protectorate by his general Avidius Cassius. This husband of Faustina the younger had his victories over the Sarmatians depicted on his victory column. He fought offensive wars versus the Iazyges, and one work by this person ends its introduction with "on the River Gran, against the Quadi". For 10 Points, name this adoptive brother of Lucius Verus and author of the Meditations, succeeded by his jackass son Commodus.
One letter from early in this man's life he relates how he, on horseback, dispersed a crowd of herdsmen and animals for the fun of it.
{Marcus Aurelius} Antoninus Augustus