Franco Cavazzi
Roman empire.net: Marcus Aurelius
Good biography of Marcus Aurelius describing the lengthy wait he had to become emperor, the fierce wars he fought, and his stoic philosophy. Also deals with the questions about Commodus and his appointments as co-emperor and emperor.
Forum Romanum
Outlines of Roman History: Decline of the Empire: The Times of the Severi
In this entry from Morey's 1901 textbook the decline of the Roman Empire is presented. The Severi emperors ranged from bad to worse, with the exception of Alexander Severus.
Authors Calendar
Author's Calendar: Marcus Aurelius
Biography of Marcus Aurelius from the perspective of his writing career, rather than his work as an emperor. Uses his own words from "The Meditations" to provide insight into his character.
Other
Gladiator: The Real Story
This personal site is an account that examines the movie "Gladiator," and compares it to what actually happened in Roman history. There is information about Marcus Aurelius and his son, Commodus.