Marguerite St. Just, also known as Lady Marguerite Blakeney, was a French actress and aristocrat in the 18th century, and the beautiful and beguiling wife of Sir Percy Blakeney.

Marguerite was a member of The League Of The Scarlet Pimpernel, a group of twenty people who aided Sir Percy in his undercover adventures in Revolutionary France.

Along with her husband Percy, Marguerite was a member of Gulliver's Fellowship, the second incarnation of the League.

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