Notable Muggletonian writers include Laurence Clarkson (1615 - 1667) an itinerant preacher born in Preston, Lancashire; John Saddington (1634? - 1679) a London sugar merchant, originally from Arnesby, Leicestershire; Thomas Tomkinson (1631 - 1710) a Staffordshire yeoman farmer who moved to London in the 1680s; and Isaac Frost (1793 - 1858) and Joseph Frost (1791 - 1857), brothers who ran the family metallurgy business in Clerkenwell, London.