This Federal mansion was built in 1809 for Ezra Weston II, known as “King Caesar” for his worldwide preeminence as a shipbuilder and merchant. Weston’s enterprise dominated Duxbury in the early 19th century with a large portion of the population employed in the Weston shipyards, farms, wharves, mill, ropewalk, or aboard Weston’s fishing schooners and merchant fleet. Ezra Weston’s ship Hope, built in 1841 was then New England’s largest vessel. Purchased by the Society in 1965, the house is presented for tours as it appeared in the 1820s. The house is noted for its rare French scenic wallpapers, portraits of sea captains, and 19th century furnishings. Two galleries feature rotating exhibits.