 In 1683, a group of Mennonites, Pietists, and Quakers in Frankfurt, including Abraham op den Graeff a cousin of William Penn, approached Pastorius about acting as their agent to purchase land in Pennsylvania for a settlement.Pastorius took passage to Philadelphia.In Philadelphia, he negotiated the purchase of 15,000 acres (61 km²) from William Penn, the proprietor of the colony, and laid out the settlement of Germantown, where he himself would live until his death.