The President of the United States earns a hefty $400,000 yearly salary nowadays. That’s not bad going, of course, but many presidents were already wealthy to begin with. Moreover, a career in writing or giving talks often awaits after their time in office has come to an end. All this is to say that some presidents have been worth significantly more than even their $400,000 salary might suggest. Here, with adjustments made to account for inflation, we take a look at the 20 wealthiest in history.