Robert and Thomas Wintour is written about the Gunpowder Plot is derived from Thomas's confession, signed on 23 November 1605; details of the so-called Spanish Treason were added three days later. One of only two confessions printed in the "King's Book" (a highly partial contemporary account of the affair), Thomas Wintour's was the only account the government had of a plotter who had been involved from the beginning; Guy Fawkes, weakened by days of torture, may have been at the heart of the group, but he was not at its first meetings. However, Antonia Fraser views the document with suspicion, not least because Thomas's
Robert and Thomas Wintour plot is based on Thomas's confessions, given in the Tower of London in November 1605. The brothers were tried on 27 January 1606, and hanged, drawn and quartered several days later in London. Robert (b. 1568) and Thomas Wintour (b. 1571–72) were sons of George Wintour of Huddington Court in Worcestershire, and his wife Jane (née Ingleby), daughter of Sir William Ingleby of Ripley Castle near Knaresborough. A sister, Dorothy, married another conspirator, John Grant. Two agnate half-siblings, John and Elizabeth, resulted from their father's marriage to Elizabeth Bourn, following Jane's death. Their paternal grandparents were Robert Wintour of Cavewell