John Moore, an Alderman of London, was a tenant of Eastbury Manor House in 1603. Moore was married to a Spanish woman, Maria Perez de Recalde, and was a known Catholic. His stepdaughter was married to Lewis Tresham, younger brother of plotter Francis Tresham.
Over the centuries following the Gunpowder Plot local legends sprung up that the plot itself was first contrived at Eastbury Manor House. As Francis Tresham was only brought into the plot in October 1605 this is now believed to be unlikely but the link to the Tresham family is undeniable.