Somers was originally inhabited by Native Americans known as Kitchawanks, part of the Wappinger tribe, an Algonquian people who called the land Amapaugh, meaning "fresh water fish." This land was located in the eastern segment of an 83,000-acre (340 km2) tract King William III of England granted to Stephanus Van Cortlandt of New York City in 1697. The part of Van Cortlandt Manor that ultimately became Somers and Yorktown was known as the Middle District, or Hanover. Somers was in a minor dispute with Baraboo, Wisconsin, over which community is the "birthplace" of the American circus.