A declaration of indulgence for dissenters issued by Charles II, in 1672, now made his life easier, and with an ample estate, he settled at Rickmansworth, in Hertfordshire. He was active for a few years in preaching and wrote much.
In 1675 his thoughts were first seriously turned to America. Lord Berkeley and Sir George Carteret, who had received from the Duke of York the promise of New Jersey, sold the western half to two Quakers, John Fenwick and Edward Byllinge.
The new purchasers had some difficulty between themselves in the settlement of their respective claims and asked William Penn to arbitrate the matter. Penn decided in favor of Byllinge, who soon afterwards became embarrassed and transferred to Penn and two others his interest for the benefit of his creditors.
West New Jersey was opened for sale and the persecuted Quakers found there a haven of rest.
Penn wrote to Richard Hartshorne, a settler whom he appointed his agent, “We lay a foundation for after ages to understand their liberty as men and Christians, that they may not be brought in bondage but by their own consent; for we put the power in the people.”
The colony prospered greatly under the management of Penn and his friends.
In company with George Fox, Robert Barclay and others, in 1677, Penn paid a religious visit to Holland and Germany. Here he made a convert of the Princess Elizabeth Palatine, granddaughter of James I, a woman of great intelligence, learning and spirituality, who became a devoted adherent and correspondent.
More important, historically, however, he began that acquaintance with the Rhine Valley which resulted in a great emigration of its inhabitants to his future province of Pennsylvania, in the following century.
His journal of this trip is among his printed works.
When he returned he found persecution breaking out anew, many of his friends in jail and their estates confiscated.