Thomas Keyes or Keys was captain of Sandgate Castle, and serjeant porter to Queen Elizabeth I. Without the queen's consent, he married Lady Mary Grey, who had a claim to the throne.
Portrait of Lady Mary Grey, attributed to Hans Eworth (1571)
The succession to Elizabeth I, the childless queen of England and Ireland, was an open question from her accession in 1558 to her death in 1603, when the crown passed to James VI of Scotland, an event
Allegorical painting of the crown passing from Elizabeth I to James I, by Paul Delaroche (1828)
Title page from 1703, English translation of a Latin work of Sir Thomas Craig, a reply to the Conference about the next Succession to the Crown of England (1595) of Robert Persons on the succession to Elizabeth I