Mediumship is a form of relationship with spirits.
Attempts to communicate with the dead and other spirits have been documented back to early human history. One of the most well-known is the story Witch of Endor, who was said to have raised the spirit of the deceased prophet Samuel to allow the Hebrew king Saul to question his former mentor about an upcoming battle, as related in the First Book of Samuel in the Jewish Tanakh.
Mediumship became quite popular in the United States after the rise of Spiritualism as a religious movement. Modern Spiritualism is said to date to the mediumistic activities of the Fox sisters in New York state 1848.