Before resigning, he formally convened the already existing Council of Constance and authorized it to elect his successor.
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This addresses a concern raised in earlier centuries, specifically by 18th-century canonist Lucius Ferraris, who held that the College of Cardinals or at least its Dean must be informed, since the cardinals must be absolutely certain that the pope has renounced the dignity before they can validly proceed to elect a successor.
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Benedict had also previously been deposed by Sylvester III in 1044, and though he returned to take up the office again the next year, the Vatican considers Sylvester III to have been a legitimate pope in the intervening months (meaning that Benedict IX must be considered to have validly resigned by acquiescing to the deposition in 1044).
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