Philip Henry Stanhope, 4th Earl Stanhope FRS (7 December 1781 – 2 March 1855), was an English aristocrat, chiefly remembered for his role in the Kaspar Hauser case during the 1830s.

Origins
He was the eldest son and heir of Charles Stanhope, 3rd Earl Stanhope (1753–1816), by his second wife, Louisa Grenville (1758–1829), daughter and sole heiress of the Hon. Henry Grenville, Governor of Barbados in 1746 and ambassador to the Ottoman Porte in 1762, a younger brother of Richard Temple-Nugent-Brydges-Chandos-Grenville, 1st Duke of Buckingham and Chandos.

Career
Using his father's courtesy title Viscount Mahon, he served as a Whig Member of Parliament for Wendover from 1806 to 1807, for Kingston upon Hull from 1807 to 1812, and for Midhurst from 1812 until his succession to the peerage on 15 December 1816, when he took his seat in the House of Lords. He shared his father's scientific interests and was elected a Fellow of the Royal Society on 8 January 1807 and was a president of the Medico-Botanical Society. He was a vice-president of the Society of Arts.

Like other members of his gifted family, notably his half-sister Lady Hester Stanhope, he is usually portrayed as a somewhat eccentric character. Having studied in Germany, he travelled extensively in Europe (mostly alone, though he was married and had a son and a daughter), which brought him into contact with  various princely courts and which caused him great expenditure. In contrast to some accounts, which suggest that he lived beyond his means, it appears that he remained wealthy, certainly after he had succeeded to his father's estates in 1816.

His eccentricity may be understandable since, as his daughter the Duchess of Cleveland wrote in her Life and Letters of Lady Hester Stanhope, his own father refused to send him to school but kept him at the family home of Chevening.  The plan was that Philip would agree to his father's terminating the entail on the estates. The biography implies that the Earl would then have sold the estates and sent the money overseas, impoverishing his family. Hester helped her brother escape and her letters, quoted in the Life, record that William Pitt the Younger and others rejoiced over what she had done.

Kaspar Hauser case
Stanhope became interested in the story of the "foundling" (a.k.a. "feral child") Kaspar Hauser, a youth who had appeared in Nuremberg in 1828 and had become famous through his claim that he had been raised in total isolation in a dark room and could tell nothing about his identity. Furthermore, Hauser was found with a cut wound in 1829 and claimed to have been attacked by a hooded man. This led to various rumours that he might be of princely parentage but also suspicions that he was an impostor.

Stanhope first met Hauser in 1831 and soon felt a strong affection for the young man; indeed, their relationship could have had homoerotic undertones, as contemporary rumours suggested. He endowed him generously and paid for (unavailing) inquiries in Hungary to clarify the young man's origin, as the latter, in 1830, had claimed to remember some Hungarian and Slavic words which had led to speculations that he might originate from there.

Hauser's custodian, Baron von Tucher, criticised Stanhope's pedagogically wrong behaviour towards Hauser and retired from his custodianship. Stanhope, in December 1831, became Hauser's foster-father and transferred him to the care of a schoolmaster.

In January 1832, he returned to England from where he continued to communicate by letter with his fosterling and also with officials examining the case. Stanhope had favoured the theory that Hauser stemmed from Hungarian magnates but had to give up this idea when he was informed that further inquiries in Hungary had, once more, failed completely. In a letter to the Bavarian court president Anselm von Feuerbach (dated 5 October 1832), Stanhope now clearly uttered his doubts in Hauser's credibility.

While he continued to pay for his foster son's living expenses, he never made good on his promise that he would take him to England and his letters to Hauser became less affectionate. Hauser did realise this change of mood. On 14 December 1833, Hauser came home with a deep wound in his chest and claimed to have been stabbed by a stranger. He died three days later.

Although Stanhope had long stopped believing in Hauser's tales, he at first was of opinion that Hauser had indeed been murdered, a view he mentioned in one of his letters (dated 28 December). In another letter from 7 January 1834, when he had received more information on what had happened, a change of mind announced itself; he would later advocate the position that Hauser himself had inflicted the wound by pressure, and that, after he had squeezed the point of the knife through his wadded coat, it had penetrated much deeper than he had intended.

In his Tracts Relating to Caspar Hauser (1836, German original: 1835) Stanhope published all known evidence against Hauser:The more I was deceived in this affair, and the more erroneous were my views, the more is it now my duty to act with zeal, and, if it were in my power, with ability, to preserve others as far as possible from similar errors. Though I have on that account appeared in an unfavourable light to some of those who are known or unknown to me, though I have been abused and even calumniated, I find a sufficient consolation in my own conscience.

Stanhope, indeed, was attacked by followers of Hauser, and even accused of contriving his death. They suggested that Hauser was a hereditary prince of Baden, and was murdered for political reasons. Some professional historians (such as Ivo Striedinger) defended Lord Stanhope as a "seeker of truth", and as a deceived philanthropist who had realised his delusion.

Anthroposophist author Johannes Mayer, however, substantiated the accusations against Stanhope in a major biographical study of him, and showed that he was in fact a British political agent working for the House of Baden against Kaspar Hauser.

Marriage and children
On 19 November 1803 he married Hon. Catherine Lucy Smith, daughter of Robert Smith, 1st Baron Carrington, by whom he had two sons and one daughter:
Philip Stanhope, 5th Earl Stanhope  (1805–1875), a historian.
Hon. George Joseph Stanhope (17 March 1806 – 25 November 1828), diplomat, died in Rio de Janeiro
Catherine Lucy Wilhelmina Stanhope (1819–1901), a historian known as the "Duchess of Cleveland", author of the Battle Abbey Roll, who married twice:
Firstly to Archibald Primrose, Lord Dalmeny (1809–1851), by whom she had children, including Archibald Primrose, 5th Earl of Rosebery, Prime Minister of the United Kingdom.
Secondly in 1854 to Harry Powlett, 4th Duke of Cleveland (1803–1891), youngest son of the 1st Duke of Cleveland. The marriage was without children.

References 

Philip Henry Earl Stanhope: Tracts Relating to Caspar Hauser, Hodson 1836
Catherine Lucy Wilhelmina (Stanhope) Powlett, Duchess of Cleveland: The True Story of Kaspar Hauser from Official Documents, Macmillan, London, 1893
Andrew Lang: The Mystery of Kaspar Hauser (in: Historical Mysteries, 1905)
Catherine Lucy Wilhelmina (Stanhope) Powlett, Duchess of Cleveland: The Life and Letters of Lady Hester Stanhope, Murray 1914
Ivo Striedinger: Neues Schrifttum über Kaspar Hauser, in: Zeitschrift für bayerische Landesgeschichte, 6. Jg. 1933, pp. 415–484, especially pp. 424–429
Aubrey Newman: The Stanhopes of Chevening A Family Biography. Macmillan, London 1969
Jean Mistler: Gaspard Hauser, un drame de la personnalité, Fayard 1971 
Fritz Trautz: Zum Problem der Persönlichkeitsdeutung: Anläßlich das Kaspar-Hauser-Buches von Jean Mistler, in: Francia 2, 1974, pp. 715–731, especially pp. 719–721 and pp. 725–726

Footnotes

External links 
 

1781 births
1855 deaths
Earls Stanhope
Mahon, Philip Henry Stanhope, Viscount
Mahon, Philip Henry Stanhope, Viscount
Mahon, Philip Henry Stanhope, Viscount
Mahon, Philip Henry Stanhope, Viscount
Stanhope, E4
Politics of Kingston upon Hull
Whig (British political party) MPs for English constituencies
Philip
Fellows of the Royal Society
People from Chevening, Kent
Kaspar Hauser