The Monteagle letter was an anonymous letter sent to Lord Monteagle, warning him to stay away from the opening of Parliament on November 5, 1605. This letter was instrumental in exposing the plot to kill King James I of England by blowing up the House of Lords [1000×1463]

Now housed at the National Archives in Kew, England.

Transcript:
> My lord, out of the love I beare to some of youere frends, I have a care of youre preservacion, therefore I would aduyse you as you tender your life to devise some excuse to shift youer attendance at this parliament, for God and man hath concurred to punishe the wickedness of this tyme, and thinke not slightly of this advertisement, but retire yourself into your country, where you may expect the event in safety, for though there be no apparance of anni stir, yet I saye they shall receive a terrible blow this parliament and yet they shall not seie who hurts them this cowncel is not to be contemned because it may do yowe good and can do yowe no harme for the dangere is passed as soon as yowe have burnt the letter and i hope God will give yowe the grace to mak good use of it to whose holy proteccion i comend yowe.

[https://www.nationalarchives.gov.uk/explore-the-collection/stories/the-monteagle-letter/](https://www.nationalarchives.gov.uk/explore-the-collection/stories/the-monteagle-letter/)

[https://en.m.wikipedia.org/wiki/Gunpowder_Plot](https://en.m.wikipedia.org/wiki/Gunpowder_Plot)