Did Italian and Spanish continue to influence each other after the fall of Roman Empire?
I was just wondering how much of an influence did the Spanish and Italian languages have on each other?
I did researched that after the roman empire fell, the Romance languages did branch off as French, Portuguese, Italian, Spanish and Romanian from them.
However, Spanish and Italian have a lot of similarities to each other in terms of pronunciations and for certain terms of the same meanings and sometimes they can be intelligible to each other on some aspects.
I did see some posts that although Italian and Spanish were already separate languages, one of them invaded the other and introduced their linguistic influence to each other including reintroducing variations of Latin words that already existed in their languages. I also found research Arabs invaded Spain and heavily influenced the Spanish language.
I also wonder if Arabic has any significant influence on Italian.
I saw some language comparisons on youtube of Spanish vs. Arabic and Italian vs. Arabic and it seems the comparisons were very similar.