The Hatfield?cCoy feud (1863??891) involved two families of the West Virginia?entucky area along the Tug Fork of the Big Sandy River.

The Hatfields of West Virginia were led by William Anderson 'Devil Anse' Hatfield while the McCoys of Kentucky were under the leadership of Randolph 'Ole Ran'l, McCoy. Those involved in the feud were descended from Ephraim Hatfield (born c. 1765) and William McCoy (born c. 1750).

The feud has entered the American folklore lexicon as a metonym for any bitterly feuding rival parties. More than a century later, the feud has become synonymous with the perils of family honor, justice, and revenge.