Do you believe the theory that he used to fight Ryuma?
But I do believe He belonged from wano as he is the God of Finance. And Wano was known for it's gold and riches but Somehow during Oden father being Shogun there was no real gold around. At least not that much.
My guess is he belonged from some Wano family (Maybe Kurozumi) that's why they are hated the most. And took all the gold somehow.
And his blade being from Kitetsu 1st generation line. This shit is old as hell , like even the sheath if wooden style.