The Harrying of the North was a series of military campaigns waged by William the Conqueror in the winter of 1069–1070 to subjugate northern England, where the presence of the last Wessex claimant, Edgar Ætheling, had encouraged Anglo-Saxon, Anglo-Scandinavian and Danish rebellions. William paid the Danes to go home, but the remaining rebels refused to meet him in battle, and he decided to starve them out by laying waste to the northern shires using scorched earth tactics, especially in the historic county of Yorkshire and the city of York, before relieving the English aristocracy of their positions, and installing Norman aristocrats throughout the region.

Contemporary chronicles vividly record the savagery of the campaign, the huge scale of the destruction and the widespread famine caused by looting, burning and slaughtering. Some present-day scholars have labelled the campaigns a genocide, although others doubt whether William could have assembled enough troops to inflict so much damage and have suggested that the records may have been exaggerated or misinterpreted. Records from the Domesday Book of 1086 suggest that as much as 75% of the population could have died or never returned.