At the age of 27, Marjorie Merriweather Post inherited her family’s cereal business and helped turn it into a leading food industry company. She wasn’t only an astute proprietor, but knew how to entertain in style: Post sported Marie Antoinette’s diamond earrings at parties, owned what was then the world’s largest private sailing yacht and, with her second husband E.F. Hutton, built a spectacular red-tile-roofed villa in Palm Beach.