- Pope St. Leo III - Biography of this pope, who died in 816. From the Catholic Encyclopedia.
- St. Leo III - An account of his pontificate.
- Leo III, Saint, pope - Short profile, from the Columbia Encyclopedia.
- Torture of Pope Leo III - Miniature from the "Grandes Chroniques de France" depicts the attempt by his predecessor's relatives to blind Leo and cut out his tongue.
- Leo III - Short biography of the man "remembered as Charlemagne's pope."
- Leo III, Pope - Biographical profile.
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