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Which pope reopened the Council of Trent in 1551?

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Painting by Nicolo Dorigati showing the opening session of the Council of Trent, with clergy in white robes seated in a grand cathedral and an altar at the center. — Council of Trent Opening session of the Council of Trent in 1545, depicted by Nicolò Dorigati, 1711; in the Museo Diocesano Tridentino, Trento, Italy.

Pope Julius III was the pontiff who reopened the Council of Trent on May 1, 1551.12

Having previously served as a co-president during the council's first period in 1545, Julius III recognized the urgent need for church reform upon his election to the papacy in 1550. He appointed a commission to facilitate the resumption of the council, which continued its work until military and political pressures necessitated a second adjournment in 1552.12