We discover Robin Hood is an ex-crusader whose kurdish wife and daughter were killed to punish him after he switched sides, and became a double-agent working for Saladin to avenge his family; he went against King John so that he could subsequently become close to King Richard, the real target.

Unfortunately, some of the people he helped were frothing English chauvinists and turned him in. King Richard, however, sensing potential local anti-monarchial uprising as he was not convinced he could keep all the serfs in line given the promise of better material conditions with wealth re-distribution which risked destablising feudal relations, so helped seal the deal with a quiet assassination of Hood and asked the historians to re-write history to what we know of it now.

#TheMovieThatCouldHaveBeen

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Nevermind just saw Octoracy's comment.