A number of buildings were located where Piazza del Duomo now stands. Ruins still exist below ground level. Tombs inside a former church, 5th-9th century. San Giovanni alle fonti Baptistery, 5.5m wide x 80cm deep, ca. 500. Excavating Piazza del Duomo, 1961-1962. Santa Tecla former cathedral, 5-6th century. Santa Tecla former cathedral, 5-6th century. Graveyard near Santa Tecla. Inside Labels