Catholic Encyclopedia - Pope St. John I, a Tuscan, was warmly received in Constantinople, but upon his return to Rome, was imprisoned by King Theodoric. He died in prison in 526. www.newadvent.org/cathen/08421a.htm
For All the Saints - Short biography of Pope St. John I. users.erols.com/saintpat/ss/0518.htm#john
Patron Saints Index - Profile of Pope St. John I. www.catholic-forum.com/saints/saintj37.htm
Popes Through the Ages - Brief biography of Pope St. John I, from the book by Joseph Brusher. www.newadvent.org/Popes/ppjo01.htm
The Ecole Glossary - Short biography of Pope St. John I, by Karen Rae Keck. cedar.evansville.edu/~ecoleweb/glossary/johni.html
