Daniel Francis Callahan
Contributor
Professor of History, University of Delaware, Newark, Delaware. Author of numerous works on medieval history.
Primary Contributions (3)
St. Peter Damian ; feast day February 21) was a Roman Catholic cardinal and a forceful figure in the Gregorian Reform movement. His personal example and many writings exercised great influence on religious life in the 11th and 12th centuries. In 1828 Pope Leo XII declared him a doctor of the…
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