The Waldo Patent, a letters patent also known as the Muscongus Patent or the Lincolnshire Patent, was a document granting title to 36 square miles (9,300 ha) of land in what is now the U.S. state of Maine. It is named variously for businessman Samuel Waldo, who eventually gained control of the patent, and for the Muscongus River, one of the grant's boundaries.
In March 1630, John Beauchamp of London, England, and Thomas Leverett of Boston, England, obtained a grant of land from a company acting under the authority of the government of England.
This grant was first known as the Muscongus Patent from the Muscongus River that formed a part of the western boundary. From the seacoast, it extended northerly between Penobscot Bay and the Penobscot River on the east, and the Muscongus River on the west, to the line that now constitutes the southern boundary of the towns Hampden, Newburgh and Dixmont.
This grant or patent conveyed nothing but the right of exclusive trade with the Native Americans—perhaps the Penobscot or Abenaki peoples—for which a trading house was built and supplied with such articles of exchange as were necessary to successful traffic. Trade was carried on without interruption to the mutual advantage of the European-American settlers and natives until the opening of the first Indian Wars in 1675, a period of 45 years.
After 1675, the patent lay dormant until 1719 when Leverett’s great-grandson, John Leverett, President of Harvard College, revived the ancient claim and formed the Lincolnshire Proprietors, also known as the Ten Proprietors, so named for the ten shares distributed, one to each member. Samuel Waldo of Boston acquired a controlling interest in the patent in 1729 and it henceforward become known as the Waldo Patent.