Marcus Aurelius was the last of the Five Good Emperors of Rome. He lived from AD 121 to 180 and was a philosopher king who wrote many great works. His book Meditations emphasized one's duty. Marcus Aurelius should have thought more about his successor, however, because his death marked the end of the Pax Romana when he passed the Emperorship on to his son.
Although considered to have been a good Emperor for Rome, he was not necessarily a friend of Christianity, which he persecuted.