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Italian pope (1559-65) who reconvened and concluded the Council of Trent.
Italian pope from 1775 to 1799, whose tragic pontificate was the longest of the 18th century.
Italian pope from 1922 to 1939, one of the most important modern pontiffs whose motto "the peace of Christ in the Kingdom of Christ" illustrated his work to construct a new Christendom based on world peace.