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Catholic Encyclopedia - http://www.newadvent.org/cathen/13728b.htm
Pope St. Sergius I, d. 701 or 702. |
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Popes Through the Ages - http://www.cfpeople.org/Books/Pope/POPEp84.htm
Account of the pontificate of St. Sergius, from the book by Joseph Brusher. |
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The Ecole Glossary - http://www2.evansville.edu/ecoleweb/glossary/sergiusi.html
Began the practice of singing the Agnus Dei during the Mass, and instituted the feast of the exaltation of the Cross. |