|Location||Île-de-Bréhat, Côtes-d'Armor, France|
|Height||187 feet (57 m)|
|Heritage||monument historique classé|
|Focal height||48 m (157 ft)|
|Range||15 nmi (28 km; 17 mi) (white), 11 nmi (20 km; 13 mi) (green, red)|
|Characteristic||Alt. Occ. W R G 12s|
Built by French engineer Léonce Reynaud in 1840, it sits on the reefs of Tréguier, near the Sillon de Talbert. It is on the western end of the Bay of Saint-Brieuc, and marks the entrance to the island of Bréhat from the Trieux channel.
The French Lighthouse Commission decided to build a lighthouse on the reefs of Tréguier in 1831, entrusting the construction of a temporary structure to a carpenter from Saint-Brieuc. The project, a white signal light, was completed in 1832, but destroyed within a year due to strong currents and surf. In April 1834, Augustin Fresnel commissioned 32-year-old engineer Léonce Reynaud to design a lighthouse.
Reynaud's approach was different, and did not fit in with the typical British-style architecture of lighthouses in 19th century Brittany. The building was constructed in two blocks: the first block was solid and modeled after the British lighthouses Eddystone and Bell Rock, while the second block was lighter in style, upon which the illumination was to be placed at its final height.
Blocks of granite were cut to size, numbered, and delivered to be assembled on site. The setbacks to construction were numerous, including several contractors backing out due to safety concerns, the proposed laying of the first stone being postponed due to bad weather, strikes shutting down the site in October 1838, and difficulties with exceeding the budget.
The light was finally lit for the first time in February 1840, with an initial height of 154 ft (47 m).
On 18 June 1903, the characteristic became white with a period of 4 seconds.
In August 1944, the Germans blew up the tower with dynamite. 49 ft (15 m) of the lighthouse disappeared into the sea, but it was quickly rebuilt and raised one floor to reach 187 ft (57 m).
The light was automated in 1982.
The lighthouse is featured prominently in the French movie A Very Long Engagement (2004), as is the entire island of Ile de Bréhat, where the hero and heroine live. Stars include Audrey Tautou, Jody Foster and Marion Cotillard.
- Base Mérimée: Notice No PA22000031, Ministère français de la Culture. (in French)
- "Classement au titre des monuments historiques de plusieurs phares ou anciens phares du littoral" [Classification of many lighthouses and old coast lighthouses as historic monuments] (in French). 22 November 2010. Archived from the original on 4 June 2012. Retrieved 26 October 2013.
- "Glann ar Mor website" (in French and English). Archived from the original on 22 September 2013. Retrieved 31 October 2013.
- "A Very Long Engagement (2004)". IMDb. Archived from the original on 7 September 2009. Retrieved 18 May 2019.