[3] Ar Men is one of the best known lighthouses because of its isolated situation and the considerable difficulties its construction has presented, and the danger in evacuating its personnel.

In 1825, the need for a light built on one of the reefs of the Chaussee de Sein was already recognized, but it was thought impracticable to build.

A commission was appointed in 1860 to look at the possibility of building a light, and after six years reported that a lighthouse should be constructed on the Ar Men.

In the first year of work, workmen were able to land on the rock on only seven occasions and could spend a total of just eight hours drilling holes for the foundation.

A two-way rope sling from the supply boat was used to transfer people to Ar Men.