The gap was named for Prince William, Duke of Cumberland, son of King George II of Great Britain, who had many places named for him in the American colonies after the Battle of Culloden. The explorer Thomas Walker gave the name to the Cumberland River in 1750, and the name soon spread to many other features in the region, such as the Cumberland Gap. In 1769 Joseph Martin built a fort nearby at present-day Rose Hill, Virginia, on behalf of Walker's land claimants. But Martin and his men were chased out of the area by Native Americans, and Martin did not return until 1775.