Question: The racehorse Orme was trained by John Porter for a duke born in which year ?

Context paragraphs:
Orme (horse): Orme (1889 – 17 September 1915) was a British Thoroughbred racehorse.  He was trained at Kingsclere by John Porter for the 1st Duke of Westminster.  As a two-year-old he won the Middle Park and Dewhurst Stakes.  As a three-year-old he was not well enough to take part in the 2000 Guineas and Epsom Derby, but came back to win the Eclipse Stakes.  Orme stayed in training as a four-year-old and won another Eclipse Stakes, becoming the first horse to win the race twice, a feat that has only been repeated four times since.  After he had retired from racing, he became a successful sire and was Champion sire of Great Britain in 1899.  His son Flying Fox won the Triple Crown and the Eclipse Stakes.  Orme also sired Epsom Derby winner Orby and 1000 Guineas winner Witch Elm.  His regular jockeys were George Barrett and Morny Cannon.

Ossory (horse): Ossory (1885-1889) was a Thoroughbred racehorse.  He was trained at Kingsclere by John Porter for the 1st Duke of Westminster.  As a three-year-old he won the Prince of Wales's Stakes and St. James's Palace Stakes at Royal Ascot.

Ormonde (horse): Ormonde (1883–1904) was an English Thoroughbred racehorse who won the English Triple Crown in 1886 and retired undefeated.  He also won the St. James's Palace Stakes, Champion Stakes and the Hardwicke Stakes twice.  At the time he was often labelled as the 'horse of the century'.  Ormonde was trained at Kingsclere by John Porter for the 1st Duke of Westminster.  His regular jockeys were Fred Archer and Tom Cannon.  After retiring from racing he suffered fertility problems, but still sired Orme, who won the Eclipse Stakes twice.

Court-martial of Fitz John Porter: The court-martial of Fitz John Porter (November 25, 1862January 22, 1863) was a major event of the American Civil War.  Major General Fitz John Porter was found guilty of disobeying a lawful order, and misconduct in front of the enemy and removed from command based on internal political machinations of the Union.  The court-martial was later found to be unjust and overturned, and Porter was reinstated in the United States Army.

Frontier (horse): Frontier (foaled 1896) was a British Thoroughbred racehorse who won the Dewhurst Plate as a two-year-old and the Ascot Derby as a three-year-old.  He was owned by the Hugh Grosvenor, 1st Duke of Westminster and trained by John Porter at Kingsclere.

Diamond Shoal: Diamond Shoal (6 May 1979 – ca.1996) was a British Thoroughbred racehorse and sire.  He showed some promise as a two-year-old, winning two of his six races.  In the following year he won only one minor race but was placed in several major races, including a third-place finish in the St Leger Stakes.  In 1983, Diamond Shoal emerged as a leading middle-distance performer, winning the John Porter Stakes in England, the Grand Prix d'Evry and Grand Prix de Saint-Cloud in France, the Gran Premio di Milano in Italy and the Grosser Preis von Baden in Germany.  He was widely regarded as the best older male racehorse in Europe in 1983.  He was retired to stud at the end of the year but had little success as a sire of winners.

Hugh Grosvenor, 1st Duke of Westminster: Hugh Lupus Grosvenor, 1st Duke of Westminster, {'1': ", '2': ", '3': ", '4': "} (13 October 1825 – 22 December 1899), styled Viscount Belgrave between 1831 and 1845 and Earl Grosvenor between 1845 and 1869 and known as The Marquess of Westminster between 1869 and 1874, was an English landowner, politician and racehorse owner.

Kendal (horse): Kendal (1883-1908) was an English Thoroughbred racehorse.  He was trained at Kingsclere by John Porter for the 1st Duke of Westminster.  He was a leading two-year-old, but retired due to injury.  He later became a successful stallion and was Champion sire in 1897.

Orbit (horse): Orbit (foaled 1885) was a Thoroughbred racehorse.  He was trained at Kingsclere by John Porter for the 1st Duke of Westminster.  As a three-year-old he won the Eclipse Stakes.

Friar's Balsam (horse): Friar's Balsam (1885–1899) was an English Thoroughbred racehorse.  He was the outstanding British two-year-old of 1887, when he was unbeaten in seven races.  He was a sick horse when a beaten favourite in the following year's 2000 Guineas, but returned in the autumn to beat Minting in the Champion Stakes.  Friar's Balsam was retired to stud where he had some success as a sire of winners.  He was trained at Kingsclere by John Porter for Lord Alington and Sir Frederick Johnstone.

Supporting paragraphs: Orme (horse) Hugh Grosvenor, 1st Duke of Westminster
Answer: 1825