He was the son of Peregrine Bertie, 2nd Duke of Ancaster and Kesteven and Jane Brownlow, and the younger brother of Peregrine Bertie, 3rd Duke of Ancaster and Kesteven, and uncle of Robert Bertie, 4th Duke of Ancaster and Kesteven and Priscilla Bertie, 21st Baroness Willoughby de Eresby.
He was baptized in London in the Church of Street Giles in the Fields, Holborn. Ancaster married twice. The dukedom and the marquessate became extinct on his own death, while the earldom passed to his kinsman Albemarle Bertie.
The Duke of Ancaster"s funeral took place on 17 February 1809 at Swinstead.
12th Parliament of Great Britain. 13th Parliament of Great Britain. 14th Parliament of Great Britain]
Bertie was Member of Parliament for Lincolnshire from 1761 to 1779, became Lord Lieutenant of Lincolnshire on 12 February 1779, and was invested as Privy Counsellor on the same day.
