Catholic Encyclopedia - Pope St. Eugene I, made bishop of Rome after Pope St. Martin I had been in exile for 14 months. Eugene died in 657. www.newadvent.org/cathen/05598a.htm
Catholic Online - Biographical paragraph on Pope St. Eugene I. saints.catholic.org/saints/eugene.html
For All the Saints - Short biography of Pope St. Eugene I. users.erols.com/saintpat/ss/0602.htm#euge
Popes Through the Ages - Biography of Pope St. Eugene I, from the book by Joseph Brusher. www.newadvent.org/Popes/ppeg01.htm
The Ecole Glossary - Brief biography of Pope St. Eugene I, by Karen Rae Keck. cedar.evansville.edu/~ecoleweb/glossary/eugenei.html