Wesleyanism, or Wesleyan theology, is a movement of Protestant Christians who seek to follow the "methods" or theology of the eighteenth-century evangelical reformers John Wesley and his brother Charles Wesley. More broadly, it refers to the theological system inferred from the various sermons, theological treatises, letters, journals, diaries, hymns, and other spiritual writings of the Wesleys and their contemporary coadjutors such as John William Fletcher.