The Life and Exploits of the Scarlet Pimpernel, a fictional biography of Percy Blakeney published in 1938, named the nineteen members of the League of the Scarlet Pimpernel.[12]
- The original nine League or founder members who formed the party on 2 August 1792: Sir Andrew Ffoulkes (second in command), Lord Anthony Dewhurst, Lord Edward Hastings, Lord John Bathurst, Lord Stowmarries, Sir Edward Mackenzie, Sir Philip Glynde, Lord Saint Denys, and Sir Richard Galveston.
- Ten members enrolled in January 1793: Sir Jeremiah Wallescourt, Lord Kulmstead, Lord George Fanshawe, Anthony Holte, John Hastings (Lord Edward's cousin), Lord Everingham, Sir George Vigor, Bart., The Honorable St. John Devinne, Michael Barstow of York and Armand St. Just (Marguerite's brother).
Three members of the League have betrayed their oath of loyalty:
- In the short story "The Traitor" in The League of the Scarlet Pimpernel, in November 1793 while accompanying the League on a mission to rescue "some women of the late unfortunate Marie Antoinette's household: maids and faithful servants, ruthlessly condemned to die for their tender adherence to a martyred queen", Lord Kulmstead seduces a young girl into helping set a trap for the Scarlet Pimpernel, but the Pimpernel escapes and an unrepentant Kulmstead is captured and sent to Paris (presumably for trial and execution).[13] In the radio series episode "The Traitor" (30 November 1952), Kulmstead is attempting to betray the League when he is shot and killed by League member Robert Kent.[14]
- St. John Devinne's betrayal of Sir Percy forms an important part of the novel Sir Percy Leads the Band, but Devinne later regrets and repents his actions, and his treachery is forgiven by Sir Percy. While his treachery is never revealed to the other members of the League, it is hinted that to regain his lost honor he will join the British Army when England and France finally declare war.
- In the novel Eldorado, Armand St. Just betrays Sir Percy to Chauvelin in order to save the life of Jeanne L'Ange, with whom he has fallen in love, not knowing that Sir Percy has already rescued her and transported her to safety. Like Devinne, Armand is tormented by what he has done, but Sir Percy also forgives him.
Marguerite, Lady Blakeney, is also named as a member of the League in the book Mam'zelle Guillotine, but it is not known when she was formally enrolled. The Prince Regent is rumored to also be a member of the League, but in the original novel he refuses to confirm or deny this, saying "My lips are sealed!"; in the novel The Elusive Pimpernel, Sir Percy tells Marguerite that he has had to report to the Prince before joining her at the village gala.
