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Catholic Encyclopedia
http://www.newadvent.org/cathen/14377a.htm
Lengthy article on Pope St. Symmachus, who died in 514.
For All the Saints
http://www.saintpatrickdc.org/ss/0719.htm#symm
Short biography of Pope St. Symmachus.
Popes Through the Ages
http://www.cfpeople.org/Books/Pope/POPEp51.htm
Short biography of Pope St. Symmachus, from the book by Joseph Brusher.
The Ecole Glossary
http://www2.evansville.edu/ecoleweb/glossary/symmachusp.html
The turbulent first five years of the pontificate of Pope Symmachus.