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For All the Saints: Leo IV
Short biography.
Lives and Times of the Popes: Leo IV
Biography. From the book by Alexis François Artaud de Montor.
Pope Leo IV
Illustrated profile.
Pope St. Leo IV
Biographical article on this Roman, who died in 855. From the Catholic Encyclopedia.
St. Leo IV
Brief account of his pontificate. From the book "Popes Through the Ages," by Joseph Brusher.
The Ecole Glossary: Leo IV
Brief biography, by Karen Rae Keck.