We are getting married in the church of St. Louis of the French, which is quite unusual since only french nationals can get married in this church in Rome!
The French community in Rome took the initiative to erect its largest church in Rome. Until then, the French met in the Vatican, in the Chapel of Santa Petronilla, which was demolished to build the present St Peter’s Basilica.
On 2 April 1478, Sixtus IV’s bull formalised the birth of this new church in the heart of the Eternal City. Between Piazza Navona and the Pantheon, the church and the French confraternity took the name of St Louis, in reference to the King of France.
It was only on 12 August 1518 that Cardinal Giulio de’ Medici—the future Pope Clement VII—laid the foundation stone in the presence of the then Pope Leo X.
The building and façade are the result of the joint architectural work of Giacomo della Porta and Domenico Fontana.
For an in-depth analysis of the Caravaggio paintings in the Contarelli Chapel, you can read this article or this article.