This picture shows the conspirators hatching the plot to blow up the King and parliament. They are grouped close together which shows that they are hatching a secret plot.
Robert Catesby, Guido (Guy) Fawkes, Thomas Winter, John Wright and Thomas Percy were known to be Catholics.
Guido Fawkes was an explosives expert. He had only recently returned to England maybe specifically to set the explosives.
Francis Tresham was only thinking of his brother-in-law's safety when he sent the letter.
Gunpowder was not normally kept in the cellars under the Houses of Parliament. It was obviously put there by the conspirators.
Guido Fawkes revealed the names of the conspirators.
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