Croesus

He's rich as Croesus.

"His arrival, I hope, will make you richer." "I shall be richer than Croesus, if he comes with plenty of money."

He who has suffered to the marrow from starvation will never forget it, even if he manages once again to become as rich as Croesus.

"An old Kabyle saying goes: "If people know I'm busy drying my figs, they think I'm as rich as Croesus, but only God knows that none of my racks are full.

“[…] They talk of you as if you were Croesus—and I expect the beggars sponge on you unconscionably.” And Vickers launched forth into a tirade very different from his platform utterances. He spoke with extreme contempt of the dense stupidity exhibited on all occasions by the working classes.

1875, Henry James, "Benvolio" in The Galaxy 20 (2) (August 1875). "Decidedly he was to be a great man, and this was not the moment for letting him go! At the same time there was something impressive in this extraordinary lapse in his eagerness—in his finding it so easy to forget his honors. It was only an intellectual Croesus, the Countess said to herself, who could afford to keep so loose an account."