Basilica of Saints Sylvester and Martin ai Monti
The Basilica of Saints Sylvester and Martin ai Monti was founded by Sylvester I (314-335) and the preparatory meeting for the first Council of Nicaea was held there in 324. In 500, 772 and 845 the church was rebuilt. The structure of the present church, modified by Filippo Gagliardi in the 17th century, takes up that of the old church and many parts were reused. The church was entrusted for centuries to the Carmelite monks of the ancient observance.