Ralph de Gael was the Earl of East Anglia. ahe was th son of an Anglo Saxon who served Edward the confessor. He was the leader of the rebellion, and was probably inhappy because he resented the loss of power and wealth.
He has taken all our powers and land. This is unacceptable!
Roger de Breteuil was the Earl of Hereford. He was the son of William FitzOsbern. FitzOsbern was an allie, and was rewarder by William by making him Earl of Hereford. Royer was unhappy because he had less control of land compared to his father, and when his father died, William took that opportunity to reduce their power.
Waltheof was the Earl of Northumbria. He was the son of Earl Siwad, but when Tostig became the Earl, he was too young to challenge him. He had submitted to William, and therefore allowed to stay as an Earl. He was part of the rebellions of the North, but was pardoned.
The main reasons for the revolt where because of the loss of power, land and privileges. All three men had less control of the land that their fathers used to. Other reasons where because of William's absence, powerful allies and Anglo-Saxon rebelliousness.
At Ralph's wedding, many important people attended, like bishops, Earls and magnets. This was the pefect opportunity for Ralph and Waltheof to plan the revolt. RAlph and Roger had anticipated support from Anglo-Saxons and from the Danish. Waltheof was the last surviving Anglo-Saxon Earl,