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In page William L. Marcy:

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In 1812, Marcy married Dolly Newell of Southbridge, who died in 1821. On April 28, 1824, he married Cornelia Knower (1801–1889, daughter of Benjamin Knower) at the Knower House in Guilderland, New York. They had three children—Samuel (1820–1862), Edmund (1832–1853), and Cornelia (1834–1888). Samuel Marcy was a United States Navy officer who was killed on board the USS Vincennes during the American Civil War. Edmund Preble was ill when he died on board the USS Preble while being transported to the Azores in the hopes of regaining his health. Cornelia Marcy was the wife of Edmund Henry Pendleton (1845–1910), a Union Army veteran who later became a successful author.