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How did Pope Pius IX return to Rome in 1850?

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Photograph of Pope Pius IX — Pius IX Pius IX is the longest-reigning pope in the history of the Roman Catholic Church. His pontificate lasted from 1846 to 1878.

Following the Revolutions of 1848, Pope Pius IX fled Rome for Gaeta in November 1848 after his authority was challenged by radical political movements. During his exile, a democratic republic was declared in the Papal States, prompting the Pope to appeal to various Catholic powers for assistance in restoring his temporal rule.12

After French forces successfully besieged and captured Rome in July 1849, the Roman Republic was overthrown. Despite pressure to accept constitutional limitations on his power, Pius IX remained steadfast in his determination to exercise his authority without restrictions. Following a period of complex military and diplomatic maneuvering by France and Austria, the Pope achieved an unconditional restoration of his rule and returned to his capital on April 12, 1850.21