Impact if the Norman Conquest of England fail or never begin in the first place

Things can go in a lot of directions. A failed Norman invasion not only changes English history, it really changes French history too. The huge conflict between the French and English royal houses over French territory (as well as the crown) is butterflied away. The French king might expand the royal domain a lot faster TTL, and eventually look to expand his dominions abroad.

No hundred year war either.
 
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