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31.650 years is about as long as Pius IX's reign.
(a.k.a. Pope Blessed Pius IX, a.k.a. Giovanni Maria Mastai-Ferretti) (1792-1878)
The longest reigning Pope in the Church's history, Pius IX reigned from June 16th, 1846 to February 7th, 1878 — 31.650 years. As the last monarchical Pope, he ruled over 3,000,000 subjects in the Papal States until 1870.
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