- Catholic Encyclopedia - Pope St. Pius I excommunicated Marcion, and died in about 154.
www.newadvent.org/cathen/12126b.htm
- Popes Through the Ages - Account of the pontificate of St. Pius I, from the book by Joseph Brusher.
www.cfpeople.org/Books/Pope/POPEp10.htm
- The Ecole Glossary - Very short biographical summary, by Karen Rae Keck.
cedar.evansville.edu/~ecoleweb/glossary/piusi.html
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