The "Duomo di Catania" or "Cattedrale di Sant'Agata" stands on the east side of the square. Originally constructed in 1078-1093, on the ruins of an ancient Roman Thermae ("Achillean Baths"), like nearly all of Catania, the devastating 1693 earthquake, leveled most of the structure, and Giovanni Battista Vaccarini designed a Baroque structure and façade in 1711.