"Although Columbus enjoyed a substantial revenue from Hispaniola gold during the last years of his life, he repeatedly attempted (unsuccessfully) to gain an audience with King Ferdinand, whom he felt owed him further redress."
I don’t recall how wealthy he was, but the claim that he pursued was a percentage (15% comes to mind, but don’t quote me) of all revenues generated by Spain in the New World.
"Although Columbus enjoyed a substantial revenue from Hispaniola gold during the last years of his life, he repeatedly attempted (unsuccessfully) to gain an audience with King Ferdinand, whom he felt owed him further redress."
So I'm thinking - well off, but not wealthy.