The church of Santa Maria Maggiore is the main church of Cerveteri. It includes an ancient church and a new church, linked together.
It was originally built in the 700s, and was rebuilt c1100; it is the oldest cathedral in Tuscania. Italia website, Church of S. Maria Maggiore
The church contains a Pietà which is believed to have been created by Perin del Vaga. S Maria Maggiore Cerveteri website, Santa Maria Maggiore
References
See also Santa Maria Maggiore, Tuscania