 According to legend King Gradlon met Saint Corentin on the mountain Mėnez-Hom and was so impressed by the strength of his religious faith that he invited the hermit to become Bishop of Quimper.The cathedral replaced an old Roman church which had a chapel attached to it called the "Chapelle de la Victoire" where Alain Canhiart was buried in 1058.It was in 1239 that the first part of the cathedral was built when Bishop Rainaud commissioned the building of the choir, but it was not until the coming of Duke Jean V at the beginning of the 15th century that momentum gathered and the choir was covered with crisscross vaulting.