Louis Bréhier was born in Brest, France on 5 August 1868.

[2] Bréhier became a professor at the University of Paris, teaching ancient and medieval history and geography.

He presented a paper on "Les colonies d'Orientaux en Occident du Moyen Age" at the Thirteenth Congress of Orientalists in Hamburg in 1902.

[3] His travels were largely confined to the Mediterranean world that included an archaeological mission to Mount Athos in 1930.

He settled in Reims after World War II and died in this city in 1951.