Brownlow Bertie, 5th Duke of Ancaster and Kesteven British politician (1729-1809) (1729–1809) Parents Jane Brownlow Peregrine Bertie, 2nd Duke of Ancaster and Kesteven Children Lady Mary Elizabeth Bertie Siblings Peregrine Bertie, 3rd Duke of Ancaster and Kesteven Lady Jane Bertie Lady Mary Bertie Caroline Bertie unknown daughter Bertie Albinia Beckford Partners Harriot Pitt Mary Anne Layard