Emperor Marcus Aurelius: An overview of his life and reign from the Illustrated History of the Roman Empire.
Epistle of Marcus Aurelius to the Senate: Gives the text of this letter in which the emperor gives credit for his victories to the Christians.
Island of Freedom: Marcus Aurelius Antoninus: Offers a brief biography, drawn from three encyclopedias.
Marcus Aurelius: Short biography at Encarta Online.
Marcus Aurelius (121-180 AD): Biography by Petri Liukkonen of the 2nd-century Roman emperor, Stoic philosopher and author of the twelve-volume "Meditations."
Marcus Aurelius Antoninus: Article from the Catholic Encyclopedia.
On the Virtue of Antoninus Pius (r. 138-161 CE): Text of this work by Marcus Aurelius.
The Emperor Marcus Aurelius: A brief biography with bibliography by Amanda K. McVety, hosted by North Park University.
The Meditations: Full text of the twelve books, from the MIT Internet Classics Archive.
The Reign of Marcus Aurelius: The Ancient History Sourcebook presents a 4th century profile written by Eutropius.
Wikipedia: Marcus Aurelius: Illustrated biography of the emperor in this online encyclopedia.