 This folklore records how the men of Chichester defeated a Viking war party in the Vale, and the Viking leaders were buried in the Devil's Humps, giving them their alternative name of the Kings' Graves, while many of the Viking dead lie where they fell, under the yew trees on the slopes of the hill.Their ghosts are said to haunt the yew groves, and the trees themselves are said to come alive and move at night.This folklore may have had its origin in a battle between the men of Chichester and the marauding Danes that is recorded in the "Anglo-Saxon Chronicle" as having taken place in AD 894