Tarquinia CathedralTarquinia Cathedral is a Roman Catholic cathedral in Tarquinia, Lazio, Italy, dedicated to Saint Margaret and Saint Martin.HistoryFormerly the episcopal seat of the Diocese of Tarquinia, previously known as the Diocese of Corneto, since 1986 it has been a co-cathedral of the Diocese of Civitavecchia-Tarquinia.ArtThe cathedral's Vitelleschi Chapel was decorated with a series of murals by Antonio del Massaro.