The church stands in Vannes's rue de la Fontaine and rue Saint-Patern.
The church was built on the existing foundations of a much older church which held the relics of Saint Patern (the first bishop at Vannes).
The original church had been built in the 11th-century and had replaced the another church which had suffered damage at the hands of Norman invaders at the turn of the 9th and 10th-centuries.

It was in 1721 when a furious storm badly damaged the tower of the church.
On 9 May 1726 another storm hit the town and sent the rest of the tower tumbling, crushing half of the nave and part of the choir.
The building, therefore, required a major reconstruction and this reconstruction was started in 1727 under the direction of the architect Olivier Delourme (or de Lourme) and the mason Guillo.
Good progress was made with the first stone being laid on the 18 September 1727 and ten years later inauguration of the major part of the cathedral was possible.
By 1769, the nave foundations were completed although the spire of the tower was not completed until 1826 following a successful appeal for funds organised by the rector Guénanten.
The church stands in Vannes's rue de la Fontaine and rue Saint-Patern. The church was built on the existing foundations of a much older church which held the relics of Saint Patern (the first bishop at Vannes). The original church had been built in the 11th-century and had replaced the another church which had suffered damage at the hands of Norman invaders at the turn of the 9th and 10th-centuries. 
It was in 1721 when a furious storm badly damaged the tower of the church. On 9 May 1726 another storm hit the town and sent the rest of the tower tumbling, crushing half of the nave and part of the choir. The building, therefore, required a major reconstruction and this reconstruction was started in 1727 under the direction of the architect Olivier Delourme (or de Lourme) and the mason Guillo. Good progress was made with the first stone being laid on the 18 September 1727 and ten years later inauguration of the major part of the cathedral was possible. By 1769, the nave foundations were completed although the spire of the tower was not completed until 1826 following a successful appeal for funds organised by the rector Guénanten.
Église Saint-Patern de Vannes