It more than likely started in the port cities of Italy after the Roman Empire. I say after, because before that Latin was a widely spread language. After the fall of the Roman Empire, imported languages started taking over, as conquerors and immigrants came from many different parts of the ancient world: The Carolingians (mixing early German and French into northern Italy), The Visigoths (mixing German, Spanish and French), the Normans (descending from Vikings from Northern France, they took over Southern Italy), Saracens (Muslims that invaded southern Italy and settled in Sicily), the German tribes (in pre-Christian times and in the middle ages), French (taking over northern Italy in the 1400s) and Austrians. leaving Latin behind.
Latin itself morphed into what we now call the Italian language. But even "modern" Italy didn't become a cohesive nation until the 1860s, and still today Italians are very region-centric, with many varied dialects still spoken throughout the country. One example I witnessed is on the train from Bari to Rome. The announcements were in three languages: English, Italian and Southern Dialect. And believe me, Dialect sounds very different than "proper" Italian--my Dad spoke it. My Mom couldn't understand him.
Again, the port cities, like Naples, Venice, Bari or Palermo needed a way to communicate with the many different people, all speaking different tongues. Every so often a a new population and ruling class would be established, depending on who the conqueror was. Hand gestures became a necessity in Italy, and it remains today a large part of how people communicate. For this reason, this might make things easier on travelers to Italy as Italians have many ways of getting people to understand what they are saying.
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