The K-alkaline, Quaternary Roman Magmatic Province (RMP) includes several active and quiescent caldera-forming volcanoes along the Italian Tyrrhenian margin, which have erupted tens of intermediate to large volume ignimbrites, poorly studied in terms of erupted volume and associated plumbing system, with few noticeable exceptions like the 40 ka Campanian Ignimbrite from Campi Flegrei. Here we reappraise the 433 ka Tufo Rosso a...