Marcus Aurelius (; Latin: Marcus Aurelius Antoninus Augustus; 26 April 121 – 17 March 180 AD) was Roman emperor from 161 to 180, ruling jointly with Lucius Verus until Verus' death in 169 and jointly with his son, Commodus, from 177. 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.