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In 1471 King Henry VI died either from melancholy following the disastrous battle of Teweksbury or he was murdered by Edward IV who then ascended the throne... Henry Holland 3rd Duke of Exeter had a plausible claim to the throne by being John Gaunt's great-grandson (if i am not mistaken this makes him having a higher claim than Edward IV who was a great-grandson of Edmund Langley)
WI THe Duke of Exeter took the crown and proclaimed himself King Heny VII against the "usurper" Edward IV in 1471 thus continuing the Wars of the Roses?