How and why did the feudal in england share their power?

In feudal relations in England people divided into different classes. This period is called the feudal fragmentation. All peasantry is subjected to feudal exploitation: the free population acts in favor of the state, dependent population and serfs peasantry-in favor of the feudal lords, possessing over them judicial and personal power.  

The main reason why feudal kings in England share their power is too much land to rule alone.

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