Chilmark is in Dukes County of The Province of Massachusetts Bay in British Colonial America and is a town located on Martha's Vineyard, an island south of the Cape Cod Bay It was established as the first English settlement of Martha's Vineyard, Nantucket in 1642 by Governor Thomas Mayhew, the Elder (March 31, 1593-March 25, 1682); the town officially incorporated on September 14, 1694, the first town to separate from the two original towns of Tisbury and Edgartown. The new town was named for Chilmark, the ancestral home of the family of Governor Thomas Mayhew of Tisbury, in the English county of Wiltshire. In 1714, Chilmark was made a township including the island of No-mans Land