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About Antipope Clement VII
Robert of Geneva (1342 – 16 September 1394) was elected to the papacy as Clement VII by the French cardinals who opposed Urban VI, and was the first Avignon claimant of the Western Schism. Clement VII is regarded by the Roman Catholic Church as an antipope.
He was the son of Amadeus III, Count of Geneva, and was born in Geneva, in what is now Switzerland, in 1342. Appointed Protonotary Apostolic in 1359, he became Bishop of Thérouanne in 1361, Archbishop of Cambrai in 1368, and a cardinal on 30 May 1371.
In 1377, while serving as papal legate in upper Italy (1376–78), in order to put down a rebellion in the Papal States, known as the War of the Eight Saints, he personally commanded troops lent to the papacy by the condottiere John Hawkwood to reduce the small city of Cesena in the territory of Forlì, which resisted being added to the Patrimony of Peter for the second time in a generation; there he allegedly authorized the massacre of 4,000 civilians, an atrocity even by the rules of war at the time, which earned him the nickname butcher — or executioner — of Cesena.
Elected pope at Fondi on 20 September 1378 by the French cardinals in opposition to Urban VI, he was the first antipope of the Western Schism, the second of the two periods sometimes referred to as the Great Schism, which lasted until 1417. France, Scotland, Castile, Aragon, Navarre, Portugal, Savoy, Denmark, Norway, Britanny and some minor German states acknowledged his authority. Unable to maintain himself in Italy, he took up his residence at Avignon in the southern French Comtat Venaissin, where he became dependent on the French court. He created excellent cardinals but donated the larger part of the Pontifical States to Louis II of Anjou, resorted to simony and extortion to meet the financial needs of his court, and seems never to have sincerely desired the termination of the schism.
In 1389 the Shroud of Turin was denounced as a fraud by Bishop of Troyes Pierre D'Arcis in a letter to Clement VII, mentioning that the image had previously been denounced by his predecessor Henri de Poitiers, who had been concerned that no such image was mentioned in scripture. Despite the pronouncement of Bishop D'Arcis, Clement VII refrained from expressing his opinion on the authenticity of the shroud. He prescribed indulgences for pilgrimages to the shroud, so that veneration continued, though the shroud was not permitted to be styled the "True Shroud." 
He died in Avignon on 16 September 1394. He was succeeded by Benedict XIII.
Eventually it was determined that he would be recorded as an antipope rather than as a pope. Uncertainty over who the legitimate pope might be during the time of the Western Schism gave rise to the legal theory called Conciliarism, which claimed that a general council of the church was superior to the pope and could therefore judge between rival claimants.