Barrow Kings were a particularly ancient and powerful form of Wight King.
Each barrow complex was built to house a single great king and his entourage. The greatest of the old kings were buried with servants to attend them in the next world and warriors to guard them. Most moulder through the centuries, surrounded by the burial gifts of their people and ossified remains of their followers, but some are not so fortunate. Many Necromancers covet the service of a barrow king's entourage and seek out their burial sites with the aim of raising the fallen ruler - and his legions - into their service.