Peregrine Bertie, 2nd Duke of Ancaster and Kesteven

Peregrine Bertie, 2nd Duke of Ancaster and Kesteven PC (29 April 1686 – 1 January 1742), also known as Peregrine Bertie (1686–1701), Lord Willoughby de Eresby (1701–1715) and Marquess of Lindsey (1715–1723), was a British nobleman and statesman.

Bertie, who matriculated at Oxford in the late 17th century, graduated from that university in 1702. In 1708, he entered Parliament as MP for Lincolnshire, and was invested a Privy Counsellor that same year. He would serve in the House of Commons until he was summoned to the House of Lords by a writ of acceleration in his father's Barony of Willoughby de Eresby in 1715.

In June 1711, he married Jane Brownlow (d. 25 August 1736), daughter of Sir John Brownlow, 1st Baronet, by whom he had seven children:

Peregrine Bertie, 3rd Duke of Ancaster and Kesteven (1714–1778)
Lord Albemarle Bertie (d. 16 May 1765), blinded early in his youth, a gambler and sportsman depicted by Hogarth
Brownlow Bertie, 5th Duke of Ancaster and Kesteven (1729–1809)
Lady Mary Bertie (d. 23 May 1774), married on 21 February 1748 Samuel Greatheed
Lady Albinia Bertie (d. 12 February 1754), married in 1744 Francis Beckford, no issue
Lady Jane Bertie (d. 21 August 1793), married on 31 March 1743 Gen. Edward Mathew and had issue
Lady Caroline Bertie (d. 4 June 1744), married George Dewar

While serving as a Gentleman of the Bedchamber, Lord Willougby de Eresby inherited the rest of his father's titles on his death in 1723; he also inherited the hereditary Great Office of Lord Great Chamberlain and was made Lord Lieutenant of Lincolnshire in his late father's place. He had a seat on the Foundling Hospital's board of governors from the time of that charity's foundation in 1739. In 1742 he was made a Privy Counsellor. He served in these capacities, and also in the House of Lords, gaining the additional position of Lord Warden and Justice in Eyre until his death in 1742.