Portraits of Lenape chiefs Tishcohan (left) and Lapowinsa (right), painted around the time of the Walking Purchase treaty, circa 1737

Lenni Lenape chiefs Tishcohan and Lapowinsa, painted around the time of the 1737 Walking Treaty between the Lenape and William Penn's sons John and Thomas. The treaty - really an incomplete draft that Thomas Penn fraudulently represented to the Lenape as a legal document - allowed the Penn sons to lay claim to approximately 1,200 square miles of Lenape land, including the valuable "Forks of the Delaware."