Dialects of Italian do not count as seperate languages.
I was joking

Sicilian and its associated dialects and Furlan are not dialects of Italian. From the top of my head neither are Venetian, Neopolitan and Sardinian. Countrary of what you were taught in school or by parents this is fact and it is told incorrectly due to lack of knowledge.
It is very difficult to tell which of all the Italian dialects are in fact proper languages or simply dialects.
It all goes back to *at least* the 14th century, when Italy as such didn't exist and the regions that now make up Italy used all slightly languages from each other.
At this time, poets and writers started writing in those "dialects" instead of Latin, and pretty much all those dialects are still alive.
Successfully the Florentin dialect was chosen to be the official Italian language following the political unification.
But really, since all dialects formed a long time ago (long before "Italian") and still exist, you could argue that actually all Italian dialects are actually proper languages.