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The devise was a plot madeby Northumberland and Edwardvl to alter the line of succession, in order to prevent Mary becoming Queen and reconverting England to catholicism. Jane grey was to become queen, but Mary had more popular support and was more prepared, which enabled her to gain control and become queen after Edward died

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Northumberland tried to remove Mary and Elizabeth from the line of succession. He did this by getting Edward to write Lady Jane Grey as his successor in his will.

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Lady Jane Grey was

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Ed hates Mary on sly

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He was prepared to exclude both his sisters from the line of succession to ensure Protestantism survived. In June 1553, Mary and Elizabeth were declared

illegitimate, and Edward named his first cousin, Lady Jane Grey, as his successor in his will.

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Dale Hoak thought Edward VI thought of it, not the Duke of
Northumberland

Lady Jane Grey was pronounced as the next in line to the
throne as she was Protestant.

But to make it legally binding, Parliament had to be called

Edward died before Parliament was called so the Duke of
Northumberland was gutted... It was Mal

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The devise failed, as it was illegal, and Northumberland had attempted to interfere with the legitimate line of succession, by trying to bring Lady Jane Grey to the throne.

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The 'Device' had to be legally binding so a necessary call to parliament was to be held to repeal the succession Act of 1544, however Edward VI died before it could happen

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-  The Duke of Northumberland wanted to preserve the Protestantism faith established in England under Edwards VI reign therefore he got Edward VI to exclude Mary and Elizabeth from the royal succession and replaced them and in their place, his cousin Lady Jane Grey was announced as the next monarch. This was known as The Devise.

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Dale hook has argued that this devise was thought up by Ed not Northumberland