Earl of Chesterfield

Sir Philip Dormer Stanhope, PC, KG (1694 - 1773), 4th Earl of Chesterfield (cr. 1628)
4th Baron Stanhope of Shelford, co. Nottingham
Suc. in 1726

Arms: Stanhope

Motto: A Deo et Rege

There are two bookplates with the Stanhope arms with a Garter on a mantle, the first (above) with supporters and the second (see below) without supporters.

The first bookplate might be F 27861 and the second F 27859.

He was the son of Philip Stanhope, 3rd Earl of Chesterfield and Lady Elizabeth Saville daughter of of George Saville, 1st Marquess of Halifax and Gertrude Pierrepont. The title came from his great-grandmother Katherine Stanhope, Countess of Chesterfield (1609–1667) the faithful companion of Princess Mary, The Princess Royal, Princess of Orange, and Countess of Nassau, eldest daughter of King Charles I and mother of William of Orange, later king William III of England.
He married Petronilla Melusina von der Schulenburg, Countess of Walsingham, daughter of George I, King of Great Britain and Ermengarde Melusina Baronin von der Schulenberg, on 14 May 1733, without issue.
Lord Chesterfield was a Whig Member of Parliament for St. Germans between 1715 and 1722 and for Lostwithiel between 1722 and May 1723, Ambassador to Holland (1728-32) and Lord Steward of the of Household (1730-33). A member of the Cabinet in 1744 he was appointed Lord Lieutenant of Ireland in 1745.
He wrote «Letters of Philip Dormer, Fourth Earl of Chesterfield, To His Godson and Successor».
His only son Philip Stanhope (1732 – 1768), Envoy Extraordinary to the Court of Dresden predeceased him without legitimate issue and he was succeeded in the title by his kinsman Philip Stanhope, KG.

Sir Philip Stanhope, PC, KG, FSA, FRS, 5th Earl of Chesterfield (1755-1805) was the son of Arthur Charles Stanhope and Margaret Headlam and succeeded also to the title of 5th Baron Stanhope of Shelford. He was Ambassador to Spain (1784 – 1787), and Master of the Horse between 1798 and 1804.
Sources: http://en.wikipedia.org/wiki/Philip_Dormer_Stanhope,_4th_Earl_of_Chesterfield
thePeerage.Com
Chesterfield Mss.