The Saint-Thugal Tower

Installed on the city's defenses next to the South Poterne which is an open passage in the ramparts leading to the Charcoal Valley, the Saint-Thugal church is undoubtedly its oldest monument.
Originally this building was built by the monks of Saint-Severin in recognition of the protection granted to them by the city during the siege of the Saxons in 774.

Dedicated to Saint-Etienne, this church awarded Saint-Thugal in the 10th century as patron for having collected the relics saved by the monks of Treguier fleeing the Norman invaders.

There remains only a 6-storey tower supported by buttresses at the level of the southern apse which has now disappeared with its collateral nave of which only the capitals still present in the houses remain.

In 1926, the Saint-Thugal Tower was listed as a historic monument