Why did William harry the north?

William the Conqueror invaded and conquered the north of England, particularly during the Harrying of the North in 1069-1070, to suppress resistance to Norman rule and assert control over the region. The rebellion in the north, led by discontented English nobles, posed a significant threat to his authority. By devastating the area, including the destruction of villages and crops, William aimed to instill fear, deter further uprisings, and solidify Norman dominance in England. This brutal campaign ultimately led to significant loss of life and changed the social and economic landscape of the north.