William Penn, the Quaker founder of Pennsylvania, had a maternal connection to the Netherlands and visited in 1671. He returned in 1677 with George Fox and Robert Barclay and at Walta Castle, their religious community at Wieuwerd in Friesland, he unsuccessfully tried to convert the similarly-minded Labadists to Quakerism. The men also journeyed on the Rhine to Frankfurt, accompanied by the Amsterdam Quaker Jan Claus who was their translator. His brother, Jacob Claus, had Quaker books translated and published in Dutch and he later produced a map of Philadelphia.