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For All the Saints: Leo IV
http://www.saintpatrickdc.org/ss/0717.htm#leo
Short biography.
Lives and Times of the Popes: Leo IV
http://www.saint-mike.org/Papal-Library/LeoIV/biography.html
Biography. From the book by Alexis François Artaud de Montor.
Pope Leo IV
http://www.catholic-forum.com/saints/saintl25.htm
Illustrated profile.
Pope St. Leo IV
http://www.newadvent.org/cathen/09159a.htm
Biographical article on this Roman, who died in 855. From the Catholic Encyclopedia.
St. Leo IV
http://www.cfpeople.org/Books/Pope/POPEp104.htm
Brief account of his pontificate. From the book "Popes Through the Ages," by Joseph Brusher.
The Ecole Glossary: Leo IV
http://www2.evansville.edu/ecoleweb/glossary/leoiv.html
Brief biography, by Karen Rae Keck.