As established, the grant ran all the way from the St. Lawrence River to the Atlantic Ocean, between the Kennebec and St. Croix rivers, and produced what today is most of Aroostook, Piscataquis, Washington, Hancock, Penobscot, Waldo, Knox, Lincoln, Kennebec, Somerset, and Sagadahoc counties.
[1] On October 7, 1673, Massachusetts, relying on a new survey of its northern border, and responding to the Dutch capture of New York in August 1673 as a result of the Third Anglo-Dutch War, claimed 200 square miles (500 km2) of the Duke of York's territory east of the Kennebec River in present-day Maine, including the Pemaquid settlement, and established a new county there.
[2][3][4] Cornwall and Devonshire were lost to the Abenaki Indians in King Philip's War in the Autumn of 1675.
[5] Cornwall County was recreated on November 1, 1683, conforming to the original grant, still part of New York.
[6] Cornwall continued unchanged until the Spring of 1687, when it was transferred to the expanded Dominion of New England, extinguishing New York's claim to the land.