Son of Capt. Nathaniel & Bridget Cleaveland/Cleveland Cogswell
He married first Abigail Belcher 11 Oct 1787 in New London, CT - he then married Mercy Brewster (widow of Daniel Colt with whom she had two daughters) 22 May 1791 in New London, CT. William & Mercy had William II, Abigail, Sarah, William Henry, James Mason, Joanna, & Frederick
He is buried at Pachaug Cemetery Griswold, New London, CT
Sources
Find A Grave: Memorial #48390332: Pachaug Cemetery, Griswold, New London, Connecticut
"The Ancestors and the Descendants of Asa Ferris Cogswell and Arobine Haldeman Cogswell (with Allied Lines" by Helen Cogswell Trostel, Big Mountain Press, 1966
CT Town Birth Records
CT Town Marriages
CT Death & Burials Index
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DNA Connections
It may be possible to confirm family relationships with William by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with William: