Depends how you define richest while saying "in history" From Forbes... By the time Rockefeller died in 1937, his assets equaled 1.5% of America's total econom

Depends how you define richest while saying "in history" From Forbes... By the time Rockefeller died in 1937, his assets equaled 1.5% of America's total economic output. To control an equivalent share today would require a net worth of about $340 billion dollars.