Columbus isn’t great for being a governor. Nor was he the first to realize the world is a sphere. He wasn’t even the first European to discover the American continents. He is great because he had the determination convice someone to finance him, and the courage to persevere when his crew wanted to turn back. What he did was to permanently and massively change the world. What he did after that is irrelevant.
I still wouldn’t invite him to dinner.