Marcus Aurelius
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Marcus Aurelius (121–180 AD) was Roman emperor from 161 to 180, ruling jointly with his adoptive brother, Lucius Verus, until Verus' death in 169, and jointly with his son, Commodus, from 177 till Aurelius' own death. He was the last of the so-called Five Good Emperors.
He was a practitioner of Stoicism, and his untitled writing, commonly known as Meditations, is a significant source of the modern understanding of ancient Stoic philosophy. It is considered by many commentators to be one of the greatest works of philosophy.
During his reign, the Roman Empire defeated a revitalized Parthian Empire in the East: Aurelius' general Avidius Cassius sacked the capital Ctesiphon in 164. In central Europe, Aurelius fought the Marcomanni, Quadi, and Sarmatians with success during the Marcomannic Wars, although the threat of the Germanic peoples began to represent a troubling reality for the Empire. A revolt in the East led by Avidius Cassius failed to gain momentum and was suppressed immediately. Persecution of Christians increased during his reign.
His death in 180 is considered the end of the Pax Romana and the increasing instability in the west that followed has traditionally been seen as the beginning of the eventual fall of the Western Roman Empire.