They are best known for devising the theory of [[Dispensationalism]], especially as formulated by Anglican priest [[John Nelson Darby]], the founder of the "Exclusive" grouping. This theory became a core belief of [[Fundamentalism]] in the 20th century. | They are best known for devising the theory of [[Dispensationalism]], especially as formulated by Anglican priest [[John Nelson Darby]], the founder of the "Exclusive" grouping. This theory became a core belief of [[Fundamentalism]] in the 20th century. |