Senator Daniel Webster, during a speech in Saratoga Springs, New York, made the claim that Weston was "the largest ship owner, probably, in the United States.

[4] After his death, the nickname passed to his son Ezra II who greatly expanded the firms activities, built up a fleet of large sailing vessels, and made the Weston name known across the Atlantic.

[7] From the King Caesar House, Ezra Weston II directed the affairs of his fleet and presided over a ten-acre shipyard, a farm, a ropewalk, a sailcloth mill, and a large work force of sailors, carpenters and laborers.

Knapp, former Superintendent of Buildings at Harvard College, aimed to establish a preparatory school, converting King Caesar's barns into gymnasiums and classrooms.

His heirs sold it in 1937 to Dr. Hermon Carey Bumpus, Sr., former director of the American Museum of Natural History in New York, who thoroughly restored the mansion.

[12] In 1945, the King Caesar House was purchased from Dr. Herman Carey Bumpus, Jr. by Miss Alice Moran, a lawyer from New York City who had lived there for years with an Austrian couple, Emil Weber and Elizabeth Weber-Fulop.

[13] After a community fundraising effort, the Duxbury Rural and Historical Society procured the necessary funds to purchase and repair the house.