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, and 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.Wesleyanism, manifest today in Methodist and holiness churches, is named for its founders, the Wesleys.