thumb|Miniature of the Marquess of Waterford dressed in [[Eglinton Tournament|Eglinton armour, by Robert Thorburn (1840)]]
Henry de la Poer Beresford, 3rd Marquess of Waterford, (26 April 1811 – 29 March 1859), styled Lord Henry Beresford before 1824 and Earl of Tyrone between 1824 and 1826, was an Irish peer. Referred to as the "Mad Marquis", he is also remembered as an eccentric.
Background
thumb|Heraldic achievement of the [[Marquess of Waterford]]
Beresford was born on 26 April 1811, the second son of Henry Beresford, 2nd Marquess of Waterford, and the former Lady Susanna Carpenter (died 1827), only daughter of the 2nd Earl of Tyrconnell and the heiress Sarah Delaval. From the latter the Beresfords inherited the Delaval estates in Northumberland, including Ford Castle. His sister, Lady Sarah, was married to the 18th Earl of Shrewsbury. Lord Henry became heir apparent to the marquessate on the death of his elder brother, George Beresford, Earl of Tyrone, in 1824. He succeeded to the marquessate on his father's death in 1826. He was educated at Eton College and Christ Church, Oxford.
Henry Waterford was perhaps the most notorious member of the harum scarum (i.e. "reckless", "impetuous") Anglo-Irish Beresford family. but there is no documented use of this phrase before 1883. The phrase is often attributed to the Melton Mowbray incident, but there is insufficient evidence to that effect.
Connection to Spring-Heeled Jack
A popular rumour that was in circulation as early as the 1830s claimed that Lord Waterford was the main suspect behind the "Spring-Heeled Jack" phenomenon. However, as that character's acts continued after his death in 1859, Waterford cannot be given sole responsibility.
That Lord Waterford had some role has been accepted by several modern authors, who suggest that a humiliating experience with a woman and a police officer could have given him the idea of creating the character as a way of "getting even" with police and women in general.
They speculate that he could have designed (with the help of friends who were experts in applied mechanics) some sort of apparatus for special spring-heeled boots, and that he may have practised fire-spitting techniques in order to increase the unnatural appearance of his character. They also note the embroidered coat of arms with a "W" letter observed by the servant boy during the Ashworth incident, a notorious coincidence with his title's territorial designation.
Indeed, Waterford was frequently in the news in the late 1830s for drunken brawling, brutal jokes and vandalism, and was said to do anything for a bet; his irregular behaviour and his contempt for women earned him the moniker "the Mad Marquess", and it is also known that he was present in the London area at the time the first Spring Heeled Jack incidents took place. He was pointed to as the perpetrator by the Revd E. C. Brewer in 1880, who attested that Waterford "used to amuse himself by springing on travellers unawares, to frighten them, and from time to time others have followed his silly example".
An 1838 news report referred to "that turbulent piece of aristocracy" and his "nocturnal vagaries in the neighbourhood of Melton", adding that his "name in many quarters is regarded with as much terror as that of Spring-heeled Jack himself".
Sportsman
Lord Waterford was a keen horseman and in 1840 he entered two horses in the Grand National Steeplechase, regarded today as the most famous race over jumps in the world. Waterford chose to ride one of the horses, The Sea, himself but was sent off in a field of thirteen runners as a totally unconsidered outsider. Reporters noted that, at one stage during the four-and-a-half mile contest, The Sea was almost half a mile behind the leaders, but Waterford persisted and completed the course to finish last of four to complete the course.
Marriage, death and legacy
thumb|upright|Henry Beresford's wife Louisa, by [[Francis Grant (artist)|Francis Grant, 1859]]
In 1842, Lord Waterford married the Hon. Louisa Stuart, daughter of Charles Stuart, 1st Baron Stuart de Rothesay.