Yes, I'm fully aware that people believe he was from Genoa, Italy. Cristoforo Colombo in italian and Cristobal Colon in spanish is embraced in Spain as one of the most imfluential Spaniards who ever lived.
He's nationality according to Wikipedia.
It is most widely accepted that Columbus was born in the Republic of Genoa, located in modern-day Italy.[1] 188 official documents, notarial, judicial, administrative about Columbus and his family, exist in the "Archivio di Stato" (national record office) of Genoa, Italy.[2] Other theories exist that he may have been Spanish or Portuguese, but no proof has ever been determined. Clues to Columbus' origin such as learned languages and DNA samples have been studied, but to date, DNA tests to show that Columbus was caucasian and probably not a Sephardic Jew (Spanish/Portuguese).