Falkner Island (also called Faulkner's Island) is a crescent-shaped island located in Long Island Sound 3 miles (5 km) off Guilford, Connecticut, United States. The island has been visited by the Native Americans for thousands of years. Its Quinnipiac name is "Massancummock", meaning "the place of the great fish hawks". In 1641, Henry Whitfield and the founders of Guilford purchased the island from the Mohegan tribe's sachem, Uncas, as part of a transaction for the land east of East River. Purchased by the Stone family in 1715, it remained in the family until it was sold to the government in 1801.