England was split up into several large earldoms each led by an earl
Earls would enforce the law as set out by the king in each of their earldoms, helping the king govern the whole country at a time when communication was slow and difficult
Became Earl of Wessex and Sussex in 1050, led military campaigns, claimed the throne in 1066, married Edith of Mercia, and later became King of England
Became Earl of Northumbria in 1055, was ousted by Harold on behalf of King Edward in 1065, sided with Harald Hardrada in the invasion of 1066, and died during that time