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Catholic Encyclopedia
Fairly long article on Pope St. Zephyrinus, d. 217.
Catholic Online
Very brief biographical sketch of Pope St. Zephyrinus.
For All the Saints
Brief biography of Pope St. Zephyrinus.
Patron Saints Index
Profile of Pope St. Zephyrinus. Illustrated. His cultus was suppressed in 1969.
Popes Through the Ages
Overview of the pontificate of Pope St. Zephyrinus. From the book by Joseph Brusher.
The Ecole Glossary
Brief biography of Pope St. Zephyrinus, by Karen Rae Keck.