- Patron Saints Index - Profile of St. Cyril the Philosopher. Illustrated.
www.catholic-forum.com/saints/saintc08.htm
- The Ecole Glossary - Short biography of St. Cyril, also known as Constantine the Philosopher, inventor of the glagolithic (Cyrillic) alphabet, by Karen Rae Keck.
cedar.evansville.edu/~ecoleweb/glossary/cyrilaps.html
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