In this three-part series, historian Helen Castor pieces together the astonishing true story of Lady Jane Grey - the first reigning Queen of England.

In the first episode, which can now be viewed on BBC iPlayer, Helen reveals an incendiary document, written in Edward's spidery handwriting on his deathbed, which cuts his sister Mary out of the line of succession and leaves the throne to his cousin Jane. It forms the basis of a constitutional crisis that dragged the country to the edge of civil war.

You can watch the final episode of this epic tale of dynastic rivalry, intrigue and betrayal tonight (Thursday 11 January 2018) on BBC Four at 9.00pm. Catch up on the first two episodes on BBC iPlayer.

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