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Catholic Encyclopedia
http://www.newadvent.org/cathen/06789a.htm
Pope St. Gregory III, a Syrian, elected the successor of Pope St. Gregory II by acclamation, d. 741.
Catholic Online
http://saints.catholic.org/saints/gregory3.html
Pious reflection on the election and pontificate of Pope St. Gregory III, by Terry Matz.
Popes Through the Ages
http://www.ewtn.com/library/MARY/GREG3.htm
Short biography of Pope St. Gregory III. From the book by Joseph Brusher.
The Ecole Glossary
http://www2.evansville.edu/ecoleweb/glossary/gregoryiii.html
Brief biography of Pope St. Gregory III, by Karen Rae Keck.