Feudalism as practiced in the Kingdom of England was a state of human society which was formally structured and stratified on the basis of land tenure and the varieties thereof. Society was thus ordered around relationships derived from the holding of land, which landholdings are termed "fiefdoms, fiefs, or fees".
These political and military customs existed in medieval Europe, having developed around 700 A.D., flourished up to about the first quarter of the 14th century[1] and declined until their legal abolition in England with the Tenures Abolition Act 1660.
Because he was exiled by his country and anyone was a liberty to take his life if he returned. Anyone who was caught helping him was going to face consequences.