Catholic Encyclopedia: Constantine the Great
Extensive biography of the first Christian Roman Emperor who established the new capital of Rome at Byzantium which he renamed Constantinople.
www.newadvent.org/cathen/04295c.htm
Constantine I, the Great
Brief profile and links from Britannia.com.
www.britannia.com/history/bb324.html
Constantine the Great, c.274-337
Biography of the Roman emperor Flavius Valerius Aurelius Constantinus, or Constantine I.
www.historyguide.org/ancient/constantine.html
Life of the Blessed Emperor Constantine, The
Adoring chronicle of the life of Constantine the Great by Eusebius Pamphilus of Caesarea. From the Medieval Sourcebook.
www.fordham.edu/halsall/basis/vita-constantine.html