[1] Both Roger and Robert were rewarded with a substantial estate in East Anglia following the Norman Conquest of England.
In 1069 he, Robert Malet and Ralph de Gael (then Earl of Norfolk), defeated the Dane Sweyn Estrithson's invasion attempt near Ipswich.
After Ralph de Gael's fall in 1074, Roger was appointed sheriff of Norfolk and Suffolk, and acquired many of the dispossessed earl's estates.
In the Rebellion of 1088 he joined other barons in England against William II, whom they hoped to depose in favour of Robert Curthose, Duke of Normandy.
In 1100, Robert Bigod (Bigot) was one of the witnesses recorded on the Charter of Liberties, King Henry I's coronation promises later to influence the Magna Carta of 1215.
Upon his death there was a dispute over his burial place between the Bishop of Norwich, Herbert Losinga and the monks at Thetford Priory, founded by Bigod.