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Catholic Encyclopedia
http://www.newadvent.org/cathen/03144c.htm
Pope St. Caius, d. 296 after twelve years as bishop of Rome.
For All the Saints
http://www.saintpatrickdc.org/ss/0422.htm#caiu
Short essay on what little we can know about Pope St. Caius.
Popes Through the Ages
http://www.cfpeople.org/Books/Pope/POPEp28.htm
Short biography of Pope St. Caius, from the book by Joseph Brusher.
The Ecole Glossary
http://www2.evansville.edu/ecoleweb/glossary/gaius.html
Brief article on Pope St. Gaius, by Karen Rae Keck.