Question: When did the first titleholder of the title in the Peerage of Great Britain that was created in 1965 die?

Context paragraphs:
Earl Ligonier: Earl Ligonier was a title that was created twice in British history, once in the Peerage of Great Britain and once in the Peerage of Ireland.  The first creation came in the Peerage of Great Britain on 10 September 1766 in favour of the French-born soldier Field Marshal John Ligonier.  The peerage was created with normal remainder to the heirs male of his body.  He had already been created Viscount Ligonier, of Enniskillen, in the Peerage of Ireland on 31 December 1757, with normal remainder to the heirs male of his body, and Viscount Ligonier, of Clonmell, in the Peerage of Ireland on 20 May 1762, with remainder to his nephew, Edward Ligonier.  In 1763 he was also created Lord Ligonier, Baron of Ripley, in the County of Surrey, in the Peerage of Great Britain, with normal remainder to the heirs male of his body.  The barony, viscountcy of 1757 and earldom became extinct on his death on 28 April 1770 while he was succeeded in the viscountcy of 1762 according to the special remainder by his nephew, the second Viscount.  Edward Ligonier was the illegitimate son of Colonel Francis Augustus Ligonier, brother of the first Earl.  On 19 July 1776 the earldom was revived when he was made Earl Ligonier, of Clonmell in the County of Tipperary, in the Peerage of Ireland.  The titles became extinct on his death on 14 June 1782.

Baron Carteret: Baron Carteret is a title that has been created twice in British history, once in the Peerage of England and once in the Peerage of Great Britain.  The first creation came into the Peerage of England in 1681 when the fourteen-year-old Sir George Carteret, 2nd Baronet, was made Baron Carteret, of Hawnes in the County of Bedford (now Haynes Park).  The peerage was originally proposed for his grandfather Sir George Carteret, 1st Baronet, a celebrated royalist statesman, but he died before he was granted the title and as his eldest son, Philip, predeceased him, it was eventually bestowed on his grandson, George, with remainder to the latter's brothers.  The Baronetcy, of Metesches in the Island of Jersey, had been created for George Carteret in the Baronetage of England on 9 May 1645.  Lord Carteret married Lady Grace Granville, daughter of John Granville, 1st Earl of Bath.  In 1715 Lady Grace was raised to the Peerage of Great Britain in her own right as Viscountess Carteret and Countess Granville (see Earl Granville for a more details on these two peerages).  Lord Carteret and Lady Granville were both succeeded by their son John Carteret, the second Baron and second Earl.  The titles became extinct on the death of the latter's son Robert Carteret, the third Earl, in 1776.

John Spencer, 1st Earl Spencer: John Spencer, 1st Earl Spencer (19 December 1734 – 31 October 1783) was a British peer and politician.

Earl Coningsby: Earl Coningsby was a title in the Peerage of Great Britain.  It was created in 1719 for Thomas Coningsby, 1st Baron Coningsby, with remainder to his eldest daughter (by his second wife Lady Frances Jones), Margaret Newton, 1st Viscountess Coningsby, and the heirs male of her body.  He was the great-grandson of the soldier and politician Sir Thomas Coningsby.  Coningsby had already been created Baron Coningsby, of Clanbrassil, in the Peerage of Ireland in 1693, with normal remainder to heirs male, and Baron Coningsby in the Peerage of Great Britain in 1716, with similar remainder as for the earldom.  On Lord Coningsby's death in 1729 he was succeeded in the Irish barony of 1692 by his grandson Richard Coningsby, the second Baron, the son of one of Coningsby's sons from his first marriage to Barbara Georges.  However, Richard died already the same year, when the barony became extinct.  Lord Coningsby was succeeded in the English barony and the earldom according to the special remainder by his daughter Margaret Newton, 1st Viscountess Coningsby.  She had already in 1716 been made Baroness Coningsby, of Hampton Court in the County of Hereford, and Viscountess Coningsby in her own right.  Both titles were in the Peerage of Great Britain.  Lady Coningsby was the wife of Sir Michael Newton, 4th Baronet, of Barrs Court (see Newton Baronets).  She had no surviving male issue and the titles became extinct on her death in 1759.

Earl of Mount Edgcumbe: Earl of Mount Edgcumbe is a title in the Peerage of Great Britain.  It was created in 1789 for George Edgcumbe, 3rd Baron Edgcumbe.  This branch of the Edgcumbe family descends from Sir Piers Edgcumbe of Cotehele in Cornwall (descended from the younger son of Richard Edgcumbe (fl.1324) of Edgcumbe in the parish of Milton Abbot in Devon), who acquired an estate near Plymouth through marriage in the early 16th century, which was later re-named "Mount Edgcumbe" (a common tradition shared by several estates particularly on the south coast of Devon, for example Mount Tavy, Mount Radford, Mount Boone, Mount Gold (Plymouth), Mount Wise, etc.).  His descendant Richard Edgcumbe was a prominent politician and served as Paymaster-General of Ireland and as Chancellor of the Duchy of Lancaster.  In 1742 he was created Baron Edgcumbe, of Mount Edgcumbe in the County of Devon, in the Peerage of Great Britain.  He was succeeded by his eldest son, the second Baron.  He represented Plympton Erle, Lostwithiel and Penrhyn in the House of Commons and served as Lord-Lieutenant of Cornwall.  On his death the title passed to his younger brother, the third Baron.  He was an Admiral of the Blue and also held political office as Treasurer of the Household and as Captain of the Honourable Band of Gentlemen Pensioners.  In 1781 he was created Viscount Mount Edgcumbe and Valletort and in 1789 he was further honoured when he was made Earl of Mount Edgcumbe.  Both titles are in the Peerage of Great Britain.

Viscount Hampden: Viscount Hampden is a title that has been created twice, once in the Peerage of Great Britain and once in the Peerage of the United Kingdom.  The first creation came in the Peerage of Great Britain in 1776 for the diplomat and politician Robert Hampden, 4th Baron Trevor.  The title of Baron Trevor, of Bromham, had been created in the Peerage of Great Britain in 1712 for his father, the lawyer Sir Thomas Trevor.  Both titles became extinct in 1824 on the death of the first Viscount's second son, the third Viscount.

Baron Henley: Baron Henley is a title that has been created twice: first in the Peerage of Great Britain and then in the Peerage of Ireland.  The first creation came in 1760 in favour of Sir Robert Henley, Lord Chancellor of Great Britain.  In 1764 he was further honoured when he was made Earl of Northington.  On the death of his son, the second Earl, both titles became extinct.  Lady Elizabeth Henley, youngest daughter of the first Earl and co-heiress of the second Earl, married the diplomat Morton Eden.  In 1799 the Henley title was revived when Eden was created Baron Henley, of Chardstock in the County of Dorset, in the Peerage of Ireland.  Their son, the second Baron, assumed the surname of Henley in lieu of Eden and notably published a biography of his maternal grandfather.  His son, the third Baron, sat as Liberal Member of Parliament for Northampton.  In 1885 the Northington title was also revived when he was created Baron Northington, of Watford in the County of Northampton, in the Peerage of the United Kingdom.  This title gave the Barons an automatic seat in the House of Lords.

Earl Harcourt: Earl Harcourt, of Stanton Harcourt in the County of Oxford, was a title in the Peerage of Great Britain.  It was created in 1749 for Simon Harcourt, 2nd Viscount Harcourt.  He was made Viscount Nuneham at the same time, also in the Peerage of Great Britain.  Harcourt was the son of the Honourable Simon Harcourt and the grandson of Simon Harcourt, Lord Chancellor of Great Britain, who had been created Baron Harcourt, of Stanton Harcourt in the County of Oxford, in 1711, and Viscount Harcourt, of Stanton Harcourt in the County of Oxford, in 1721.  Both these titles were also in the Peerage of Great Britain.  Two of the first Earl's sons, George, the second Earl, and William, the third Earl, both succeeded in the titles.  The peerages became extinct on the latter's death in 1830.

Earl Spencer (peerage): Earl Spencer is a title in the Peerage of Great Britain that was created on 1 November 1765, along with the title Viscount Althorp, of Althorp in the County of Northampton, for John Spencer, 1st Viscount Spencer.  He was a member of the prominent Spencer family and a great-grandson of the 1st Duke of Marlborough.  Previously, he had been created Viscount Spencer, of Althorp in the County of Northampton, and Baron Spencer of Althorp, of Althorp in the County of Northampton, on 3 April 1761.

Earl Talbot: Earl Talbot is a title that has been created twice in the Peerage of Great Britain.  This branch of the Talbot family descends from the Hon. Sir Gilbert Talbot (died 1518), third son of John Talbot, 2nd Earl of Shrewsbury.  His great-great-great-grandson the Right Reverend William Talbot was Bishop of Oxford, of Salisbury and of Durham.  His eldest son Charles Talbot was a prominent lawyer and politician.  In 1733 he was raised to the Peerage of Great Britain as Lord Talbot, Baron of Hensol, in the County of Glamorgan, and then served as Lord Chancellor of Great Britain from 1733 to 1737.  He was succeeded by his eldest son, the second Baron.  He served as Lord Steward of the Household from 1761 to 1782.  In 1761 he was created Earl Talbot and in 1780 Baron Dynevor, of Dynevor in the County of Carmarthen, in the Peerage of Great Britain.  The earldom was created with normal remainder to the heirs male of his body while the barony was created with remainder to his daughter Cecil, wife of George Rice, and her issue male.

Supporting paragraphs: Earl Spencer (peerage) John Spencer, 1st Earl Spencer
Answer: 31 October 1783