Due to the many changes in the boundaries between Italy and other nations over the course of history and the ever changing laws of citizenship, the complexity requires you ask the Italian Consulate if you qualify.
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If your Italian-born Ancestor was a minor when he or she left Italy, you cannot use him or her as your proof of eligibility.
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The oldest Catasti date back to the 1300s and at the time they were the first census of the population to be recorded in the Papal States (what is now Lazio, Umbria and Marche). The most valuable are known as Catasti Onciari and were recorded in the South of Italy around the mid-1700s; the great amount of information available in these documents tell us the size of a family, the professions of all family members, their assets (i.e. property, livestock, farming tools, etc.) and finally where they lived.
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Almost every town in Italy has a civic coat-of-arms. Most of these colorful crests or banners tell a little story of each town featuring animals, mountains, trees, vineyards, castles, etc.
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While gathering the required family records, it is not uncommon to discover inconsistencies in these documents. There may be name, date or place differences or spelling errors in birth, marriage and death documents.