Saint Sixtus III
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Catholic Encyclopedia - Pope St. Sixtus III, also spelled Xystus, d. 440.
The Ecole Glossary - Brief profile of Pope St. Sixtus III mentions that he founded the first known monastery in Rome.
Popes Through the Ages - Account of the pontificate of St. Sixtus III, from the book by Joseph Brusher. Help build the largest human-edited directory on the web.