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Pope Gregory XII was born in Venice, Italy to a noble family in around 1317. His birth name was Angelo Correr.

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1380

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Titular Patriarch of Constantinople (1390)

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Titular Patriarch of Constantinople (1390)

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Cardinal-Priest of San Mareo under Pope Innocent VII (1405)

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Cardinal-Priest of San Mareo under Pope Innocent VII (1405)

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Vowed to Abdicate the Papacy to End the Schism if Elected (around 1406)

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Vowed to Abdicate the Papacy to End the Schism if Elected (around 1406)

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Pope Gregory took a vow to abdicate the papacy in order to end the schism, as long as his rival (Benedict XIII) would do the same. They both agreed to it for some time and planned to meet in Savona for further discussion. However, the meeting never took place. His rival openly did not want to renounce the papacy, and Gregory was influenced by his family and the King Ladislaus of Naples (for political reasons) who did all they could to prevent the meeting. He also claimed that he feared his rival would use the meeting as a trap to capture him, however it is unknown whether or not that was true.

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He was unanimously elected by the cardinals of Rome due to his piety and desire to end the schism.

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His cardinals are dissatisfied at their Pope's decisions and threaten to forsake him.

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Appoints Nephews as Cardinals (May 4, 1408)

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Appoints Nephews as Cardinals (May 4, 1408)

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Despite promising to the conclave that he would not appoint any new cardinals when he convened his cardinals at Lucca.

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Seven of the cardinals at Lucca managed to escape and negotiated with Benedict's cardinals to have both of their pontiff's deposed and a new one elected.

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The cardinals summoned the two pontiffs to Pisa, but neither showed up. During the fifth session, the two were deposed

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Pope Gregory XII Retaliates (June 6, 1409)

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Pope Gregory XII Retaliates (June 6, 1409)

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While Prince Charles of Malatesta's attempts of effecting an understanding between the Pope and his cardinals, Benedict XIII and Alexander V were pronounced schismatics, perjurers, and devastators of the Church at the Pope's meeting in Cividale del Friuli on June 6, 1409.

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Prince Charles of Malatesta acts in the Pope's name when he was appointed as one of his proxies in the council when a Bull of Gregory XII was read. He pronounced his resignation from the papacy with a handwritten copy of it. The cardinals accepted this and kept the cardinals appointed by him.

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Appointed Bishop of Porto and Legate of Ancona (July 4, 1415)

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Appointed Bishop of Porto and Legate of Ancona (July 4, 1415)

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Died before the new pope's election in the odour of sanctity on October 18, 1417 in Recanati, Italy.

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Pope Gregory XII was the most recent pope to resign before Pope  Benedict XVI.
(However, Gregory's resignation was not of his own choice unlike Pope Benedict's.)