  Together with Fox and William Penn (1644–1718), Fell is now regarded as one of the founders of Quakerism. She helped to sustain the movement through her large correspondence with other Friends on a range of personal and religio-political topics. She travelled widely and spent extended periods in London petitioning the political authorities on behalf of persecuted Quakers; she personally addressed not only Oliver Cromwell but also Charles II and James II. And on at least three occasions, she spent periods in prison for holding Quaker meetings at her house and for refusing to take the Oath of Allegiance. Fell married George Fox in 1669, eleven years after her first husband’s death, and she was subsequently known as Margaret Fox. Together they were active organizers of the separate Quaker women’s meetings, first officially begun in 1671.