Robert and Thomas Wintour the continent and again failed to elicit Spanish support, but instead met Guy Fawkes, with whom he returned to England. Robert, a devout Catholic who inherited Huddington Court near Worcester, joined the conspiracy the following year. The plot began to unravel following the delivery of an anonymous letter to William Parker, 4th Baron Monteagle, warning him to stay away from Parliament. Thomas and Catesby confronted Monteagle's brother-in-law, the recently recruited Francis Tresham, threatening to kill him, but Tresham managed to convince them of his innocence. At that stage Thomas reportedly asked Catesby to abandon the scheme, to no avail. When
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