Lappawinsoe was a Lenape chief. His name signifies "gathering fruit" or "going away to gather food". Lappawinsoe sold the land of his tribe to Thomas Penn (1702-1775), and John Penn (1700-1746), the sons of William Penn (1644-1718), the founder, with moderate Quaker philosophies of the Colony and Province of Pennsylvania in 1681, through the controversial and disputed Walking Purchase treaty agreement of 1737. Three other Lenape-Delaware chiefs also signed the agreement: Tishecunk, Nutimus and Menakihikon. Documentation shows that Nutimus was considered the principal Indian leader of the tribes located further southeast in the future State of Delaware.

Thomas Penn was an English landowner and mercer who was the chief proprietor of Pennsylvania from 1746 to 1775. He was one of 17 children of William Penn, the founder of the colonial-era Province of Pennsylvania in British America. In 1737, Thomas Penn negotiated the Walking Purchase, a contested land cession treaty he negotiated with Lenape chief Lappawinsoe that transferred control over 1,200,000 acres (4,860 km2) of territory in the present-day Lehigh Valley and Northeastern Pennsylvania regions of Pennsylvania and a portion of West Jersey in colonial New Jersey from the Lenape tribe to the Province of Pennsylvania.