@mdione answers in Galactic Standard are perfectly fine, don't worry!
Trieste is an *interesting* case also because it became part of Italy decades later (at the end of WWI) than the official unification (1861) or the de-facto unification (1870, conquest of Rome), and then was independent for a few years after WWII.
Other than that, yeah, there have been quite a few changes in how citizenship can be transmitted by descent through generations of people not living in Italy, afaik for Italy it was stricter in the past, then became quite liberal, and then the fascist (2.0) governments have started to add more and more restrictions, for obvious political reasons :(