The founder of the Colony, William Penn (1644–1718) in 1681, enjoyed a reputation for fair dealing with the Lenape (including the Delaware Indians). However, his heirs, John Penn ("the American") and Thomas Penn, abandoned many of their father's moderate practices. In 1736, they claimed a deed from 1686 by which the Lenape promised to sell a tract beginning at the junction of the upper Delaware River and the tributary Lehigh River (near modern Easton, Pennsylvania) and extending as far west as a man could walk in a day and a half, later to become known as the "Walking Purchase" or the Walking Treaty of 1737. This document may have been an unsigned, unratified treaty, or even an outright forgery ("Encyclopædia Britannica" refers to it as a "land swindle"). The Penns' agents began selling land in the Lehigh Valley in the disputed area along the Lehigh River to colonists while the Lenape still inhabited the area.