The London merchant William Kiffen (c.1616–1701) is commonly regarded as one of the founding fathers of the Particular Baptists in London. For over sixty years Kiffen played a significant role in the complex world of the seventeenth century, with its volatile mix of religion, politics and commerce. He established himself in the early 1640s as the leader of a Baptist congregation, became an important contact for the Cromwellian Commonwealth and Protectorate, and was intimately involved in the political manoeuvrings of the royal courts of Charles I, Charles II, James II and William III. In this volume Dr Kreitzer continues the investigation of Kiffen’s life which he began in 2010, offering twelve ground-breaking studies based on primary sources which were all previously either under-appreciated or unknown.