Peregrine Thomas Bertie, Marquess of Lindsey (1755-1758) (1755–1758) Parents Mary Bertie, Duchess of Ancaster and Kesteven Peregrine Bertie, 3rd Duke of Ancaster and Kesteven Children Siblings Priscilla Bertie, 21st Baroness Willoughby de Eresby unknown daughter Bertie Georgina Cholmondeley, Marchioness of Cholmondeley Robert Bertie, 4th Duke of Ancaster and Kesteven