There's always room for discussion, but perhaps these topics found through our search function will answer your inquiry.
Italian cooking before the introduction of the tomato
When did "traditional Italian" cuisine start and what made it happen? The Roman food is almost nothing like it.
What was Italian food like in the 14th and 15th Centuries?
How did tomatoes become so important to Italian cooking?
How did the Tomato come to be such an integral part of Italian cuisine?
What was Roman/Early Middle Ages food like in Italy?
What were some Old World cuisines like before the Columbian Exchange?
How much culinary knowledge was exchanged between China and Italy esp regarding culinary techniques?
Italian cuisine pre-Columbus