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.
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.