Revolt of the Earls

The Revolt of the Earls in 1075 was a rebellion of three earls against William I of England (William the Conqueror). It was the last serious act of resistance against William in the Norman Conquest.

The revolt was caused by the king's refusal (in his absence – he had been in Normandy since 1073) to sanction the marriage between Emma (daughter of William Fitzosbern, 1st Earl of Hereford and Adelissa de Tosny) and Ralph de Guader, Earl of East Anglia in 1075. They married without his permission.

Then, in William's absence, Ralph, Roger de Breteuil, 2nd Earl of Hereford (his new brother-in-law), and Waltheof, 1st Earl of Northumberland began the revolt; but it was plagued by disaster. Waltheof soon lost heart and confessed the conspiracy to Archbishop of Canterbury Lanfranc, who urged Earl Roger to return to his allegiance, and finally excommunicated him and his adherents, and then to William, who was in Normandy.

Roger, who was to bring his force from the west to join Ralph, was held in check at the River Severn by the Worcestershire fyrd which the English bishop Wulfstan brought into the field against him. Ralph in the meantime encountered a much superior force under the warrior bishops Odo of Bayeux and Geoffrey de Montbray (the latter ordered that all rebels should have their right foot cut off) near Cambridge and retreated hurriedly to Norwich, hotly pursued by the royal army. Leaving Emma to defend Norwich Castle, Ralph sailed for Denmark in search of help. He eventually returned to England with a fleet of 200 ships under Cnut and Hakon, but they failed to do anything effective.

...
Wikipedia