Construction of lighthouse 1861-1864 (≈ 1863)
Directed by Dujardin and Pelau, commissioning.
1929
Film shot *Lighthouse Guards*
Film shot *Lighthouse Guards* 1929 (≈ 1929)
Film by Jean Grémillon on the site.
1981
Lighthouse electrification
Lighthouse electrification 1981 (≈ 1981)
Replaces the oil steam fire.
1984
Headlight automation
Headlight automation 1984 (≈ 1984)
Modernization of signalling systems.
2016
Restoration of the guardrail
Restoration of the guardrail 2016 (≈ 2016)
Preservation work planned this year.
20 avril 2017
Historical monument classification
Historical monument classification 20 avril 2017 (≈ 2017)
Total light protection and annexes.
Aujourd'hui
Aujourd'hui
Aujourd'hui Aujourd'hui (≈ 2025)
Position de référence.
Heritage classified
The Triagoz Lighthouse, in its entirety (with the exception of the current fire and its cement base), including the annex building located at the back of the lighthouse and all its basement with kitchen, reserves and stairs, located in Manche on the plateau des Triagoz, northwest of Tregastel-Plage (Côtes-d'Armor), on the non-cadastre maritime public domain, geographical coordinates: 48°52.28 5 N 03°38.79 7 W: ranking by order of 20 April 2017
Key figures
Dujardin - Engineer
Co-Director of Construction (1861-1864).
Pelau (ou Pelaud) - Engineer
Co-Director of Lighthouse Construction.
Jean Grémillon - Director
Tour* Lighthouse Guards* in 1929.
Origin and history
The Triagoz lighthouse, built between 1861 and 1864 under the direction of engineers Dujardin and Pelau (or Pelaud according to the sources), stands on the Guen-Bras rock off Tregastel, in the Côtes-d'Armor. Built in pink granite by Ploumanac'h, its square structure with a semi-circular projection evokes a medieval dungeon, reflecting a particular attention to its aesthetics. Equipped with Fresnel lenses, it was a major tool for navigation in this dangerous area of the English Channel.
The lighthouse underwent major modernizations in the 20th century: electrification in 1981 replacing the oil steam fire and then automation in 1984. His lantern was dismantled and transferred to Lézardrieux, while restorations (such as the guardrail in 2016) sought to preserve its integrity. Ranked a historic monument in April 2017, it is one of the few Breton lighthouses that survived German destruction during the Second World War in the area.
Architecturally, the Triagoz Lighthouse is distinguished by its original interior and exterior features, including an adjacent building with kitchen and reserves, all located on a basement in a maritime public domain. The national archives retain ten plans of the lighthouse developed between 1862 and 1884, demonstrating its heritage importance. Its history is also linked to cinema, the site having served as a setting for Jean Grémillon's film Gardiens de lighthousee in 1929.
Today, the Triagoz lighthouse embodies both a functional maritime heritage and a symbol of Breton architectural resistance. Its classification protects the entire structure (excluding current fire and its cement base), as well as its immediate environment, highlighting its historical and technical value. Available sources, including engineering briefs and regional inventories, enrich the understanding of its construction and evolution.
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