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 Catesby he was to be allowed to "call in whom he thought best". Catesby soon added Ambrose Rookwood, a staunch Catholic who was both young and wealthy, but who most importantly owned a stable of fine horses at Coldham. For the plan to work Rookwood and his horses needed to be close to the other conspirators, and so Catesby persuaded him to rent Clopton House at Stratford-upon-Avon. Francis Tresham was brought into the plot on 14 October. Also descended from William Catesby, Tresham was Robert's cousin, and as young children the two had often visited White Webbs. Although his account of