The Church of Saint-léon bears the name of Saint Leo I the Great, for the first time approved the rule of the Pope of Rome over the Christian patriarchs. As often happens, patron Saint of the Church was chosen so that its name matches the name of a man whose donations helped to Fund the construction of, – it was a rich parishioner Leon File.

The history of the Church standard for Paris early XX century: the rapid economic development of blocks South from the Eiffel tower and rapid population growth required the construction of the temple. The design of the building in the Romanesque style was designed by architect Emile Brunet. He used the materials that will drastically speed up construction and reduce its cost: concrete and brick. Construction began in 1924, it was completed exactly ten years.

The Church was dedicated to the Leo I the Great, who played in the history of the Catholic Church a special role. Elected to the papacy in 440 year, he vigorously fought overwhelming at the time, the Christian world heresies. The lion I was able to approve the special status of the Pope, directly following from the words of Christ said the first Bishop of Rome, the Apostle Peter: "...Thou art Peter, and upon this rock I will build My Church; and the gates of hell shall not prevail against it." The Saint possessed of rare personal courage: in 452 he personally came out to meet the leader of the Huns Attila and persuaded not to destroy Rome. Three years later, the Pope repeated the feat, having met with the leader of the vandals by Gaiseric, he entered the Eternal city, but not betrayed him with fire and sword. Leo I the Great was the first Pope, who was buried in St. Peter's Basilica in the Vatican.

Vivid and harmonious appearance of the Church of Saint-léon make her worthy patron. Mosaic pediment depicts the Holy Lion. In the interior of the temple is a special place also in a striking mosaic of important episodes of the first acts of the Pope: warring and propitiation of the barbarians, the reading of the documents of the Council of Chalcedon. The deeds of Pope dedicated and bright stained glass works of Auguste Laboure.

Church choir arches decorated with wonderful Byzantine mosaics and decorated with wrought-iron decorations, made by master Raymond SUBA. In the chapel of St. Joseph is an unusual landscape Henri Bouchard: the head of the Holy Family placed her hands on the shoulders of the little Jesus, they are surrounded by ordinary carpentry accessories – saw, planer, workbench.