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Robert Guibé (died 1513) (called the Cardinal of Nantes) was a French Roman Catholic bishop and cardinal.

Robert Guibé was born in Vitré ca. 1460, the son of Adanet Guibé and Olive Laudais.^[1][2]

In 1475, he became cantor of the cathedral chapter of Dol Cathedral.^[1] He became archdeacon of the Basilica of the Holy Saviour in Dinan in 1481.^[1]

On May 16, 1483, he was elected Bishop of Tréguier.^[1] On August 18, 1483, he took the oath before Francis II, Duke of Brittany; the duke sent him to Rome as head of an embassy to pay homage to the newly elected Pope Innocent VIII.^[1] He became Prior of the Benedictine Abbey of the Holy Cross in Vitré in 1490.^[1] He became Prior of Châteaugiron in 1495. As of the Synod of Tréguier, held June 11, 1495, he had not yet been consecrated as a bishop.^[1] In 1499, Anne of Brittany sent him to Rome to secure a papal bull for the election of Guillaume Gueguien as Bishop of Nantes.^[1] On March 24, 1502, he was transferred to the see of Rennes upon the death of the previous bishop, his brother Michel.^[1] In 1503, he returned to Rome a third time, this time as the ambassador of Louis XI of France.^[1]

Upon the recommendation of Anne of Brittany, Pope Julius II made Guibé a cardinal priest in the consistory of December 1, 1505.^[1] He received the red hat and the titular church of Sant'Anastasia on December 17, 1505.^[1]

He was transferred to the see of Nantes on January 24, 1507, occupying this see until May 30, 1511, when he resigned in favor of a nephew.^[1] He spent 1510 as apostolic administrator of the see of Amalfi.^[1] On September 30, 1510, he became administrator of the see of Albi, occupying this office until his death.^[1] On March 17, 1511, he became administrator of the see of Vannes, also occupying this office for the rest of his life.^[1]

In 1511, he again served as the ambassador of Louis XI of France to Rome.^[1] However, the cardinal ultimately sided with the pope in his dispute with the king.^[1] In retaliation, the king seized the rents of all his benefices, reducing the cardinal to poverty.^[1]

On October 4, 1511, he became archpriest of the Basilica di Santa Maria Maggiore.^[1] He served as Camerlengo of the Sacred College of Cardinals in 1512 and 1513.^[1] He participated in the Fifth Council of the Lateran in 1512.^[1]

He participated in the papal conclave of 1513 that elected Pope Leo X.^[1] The new pope named him legate a latere to the Kingdom of France, though he died before he could leave on this legation.^[1]

He died in Rome on November 9, 1513.^[1] He was initially buried in Sant'Ivo dei Bretoni.^[1] His remains were later transferred to Rennes Cathedral.^[1]