William Philip Molyneux, 2nd Earl of Sefton

William Philip Molyneux, 2nd Earl of Sefton (18 September 1772 – 20 November 1838), also known as Lord Dashalong, was a sportsman, gambler and a friend of the Prince Regent.

Born in 1772, Lord Sefton was the only son of Charles Molyneux, 1st Earl of Sefton and Isabella Stanhope, daughter of the Earl of Harrington. In 1792, he married the Hon Maria Craven, daughter of William Craven, 6th Baron Craven. He had issue of four sons and six daughters. He succeeded to the title in 1795 and it passed in turn on his death in 1838 to his eldest son Charles William Molyneux, 3rd Earl of Sefton.

Charles Greville wrote of him:

Educated at Eton College and at the University of Oxford, despite an unsuccessful attempt to be MP for Liverpool in 1818, he sat as MP for Droitwich, Worcs between 1816 and 1831. Sefton opposed the surveyance of the world's first railway line, the Liverpool and Manchester Railway line, in 1824 and did his utmost to prevent it. Ultimately, he was not successful in preventing the railway's construction in 1830.

On 20 June 1831, he was created Baron Sefton of Croxteth in the Peerage of the United Kingdom which allowed him to sit in the House of Lords. He also accepted the Stewardship of the manor of East Hundred, in the county of Berkshire.

Sefton was an enthusiastic gambler and sportsman whose main sporting success was in the founding and governance of sports events.

He was the third man to be appointed Master of The Quorn (1800–1805). In 1836, he founded the Waterloo Cup for coursing at Great Altcar in Lancashire, an event which was very popular in its heyday and attracted large crowds. The last Waterloo Cup took place in 2005. Over the years, Aintree had been the site of private races between the Molyneux family and their friends, including the Stanleys. Lord Sefton leased land at Aintree to the Waterloo Hotel (a hotel in Liverpool's Ranelagh Street) to help establish what is now Aintree Racecourse, home of the Grand National Steeplechase, of which he was one of the principal sponsors and a committee member.

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