[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] 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] On March 17, 1511, he became administrator of the see of Vannes, also occupying this office for the rest of his life.
[1] In retaliation, the king seized the rents of all his benefices, reducing the cardinal to poverty.