As far as I know (not much in fact) the will has been disputed, but my point here is that it's baseless to claim Columbus was Italian, when we at most can attest his birthplace (and even "Genova" could be both the city and the Republic of Genoa, so there are different cities in Liguria who claim to be his birthplace) But my point is that he basically lived his whole life in the Iberian peninsula, and never really gave any hints about being part of a different nationality. Also "nations" and national identity can't be intended in the modern sense here. Another thing is that, in his will he calls himself Colon not Colombo, as the Genoese theory claims his name should be. I think that's still a valid hypothesis, but it's far from being a historical proven fact.