St. Geneviève is remembered as the protector of Paris, credited with saving the city from the Huns in 451. Because of her bravery, her shrine has attracted pilgrims for centuries and remains an important spiritual site in Paris.
The church as seen today was built over a long period, from 1492 to 1626, which is why it shows a blend of both Gothic and Renaissance architectural styles. Among its special features is the Renaissance rood screen, a beautifully carved stone structure separating the nave from the choir. This screen is unique in Paris, as it is the only one of its kind still standing in the city.
Source - https://en.wikipedia.org/wiki/Saint-%C3%89tienne-du-Mont