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When was Bernard of Clairvaux declared a doctor of the church?

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St. Bernard of Clairvaux — St. Bernard of Clairvaux St. Bernard of Clairvaux, detail of an altarpiece by the Florentine School, early 15th century; in the Staatliche Museen zu Berlin.

St. Bernard of Clairvaux was declared a doctor of the church by Pope Pius VIII in 1830.12