A Baroque building designed by Italian master Francesco Borromini in the 17th Century, the Oratory of Saint Philip Neri was founded by the Brothers of Saint Philip Neri (Filippini). It is placed next to the Chiesa Nuova, adjacent to Corso Vittorio Emanuele II. The Congregation of the Oratory chose Francesco Borromini to realize this building for his style, both rigorous and simple: the building was constructed using 'poor' materials such as bricks, stucco and plaster, in order to mirror the beliefs of austerity and modesty of the Congregation. After the Italian Unification, the building became property of the newly defined Kingdom of Italy, and was chosen as the seat for the city's court. Today, its historical library is still open to the public.