Petworth House. Petworth House in the parish of Petworth, West Sussex, England, is a late 17th-century Grade I listed country house, rebuilt in 1688 by Charles Seymour, 6th Duke of Somerset, and altered in the 1870s to the design of the architect Anthony Salvin. It contains intricate wood-carvings by Grinling Gibbons. It is the manor house of the manor of Petworth. For centuries it was the southern home for the Percy family, Earls of Northumberland. Petworth is famous for its extensive art collection made by George Wyndham, 3rd Earl of Egremont, containing many works by his friend J. M. W. Turner. It also has an expansive deer park, landscaped by Capability Brown, which contains the largest herd of fallow deer in England. The manor of Petworth first came into the possession of the Percy family as a royal gift from Adeliza of Louvain, the widow of King Henry I, to her brother Joscelin of Louvain. He later married the Percy heiress and adopted the surname Percy. His descendants became the Earls of Northumberland, the most powerful family in northern England. The Percy family, whose primary seat was at Alnwick Castle in Northumberland, bordering Scotland, intended Petworth to be for their occasional residence only. However, in the late 16th century, Queen Elizabeth I grew suspicious of the Percy family's allegiance to Mary, Queen of Scots, and confined them to Petworth. In 1670 Josceline Percy, 11th Earl of Northumberland died without a male heir, and thus his considerable fortune and estates of Petworth House, Alnwick Castle, Syon House and Northumberland House were inherited by his 2-year-old daughter and sole-heiress, Lady Elizabeth Percy. In 1682, at the age of 16 and already twice widowed, she married the 20 year old Charles Seymour, 6th Duke of Somerset, whose family seat was Marlborough Castle in Wiltshire. They became one of the wealthiest couples in England. The site was previously occupied by a fortified manor house built by Henry de Percy, 1st Baron Percy, the 13th-century chapel and undercroft of which still survive. Since 1750 the house and estate have been owned by the prominent Wyndham family, descended from Sir Charles Wyndham, 4th Baronet of Orchard Wyndham in Somerset, a nephew and co-heir of Algernon Seymour, 7th Duke of Somerset. As part of the inheritance and splitting-up of the great Percy inheritance, which had been a source of contention between the 7th Duke and his father the 6th Duke, in 1749 after the death of the 6th Duke, King George II granted the 7th Duke four extra titles in the peerage, including Baron Cockermouth and Earl of Egremont, which latter two were created with special remainder to Sir Charles Wyndham, the intended and actual recipient of Petworth, Cockermouth Castle and Egremont Castle. The 7th Duke's only daughter Lady Elizabeth Seymour and her husband Sir Hugh Smithson, 4th Baronet, received the other Percy estates, including Alnwick Castle and Syon House, together with the titles Baron Warkworth of Warkworth Castle and Earl of Northumberland, created also in 1749 with special remainder to Smithson. The 6th Duke had conceived a violent dislike for Smithson, the husband of his granddaughter, and wrote to her stating You are descended by many generations from the most ancient families in England and it is you who doth add ancient blood to Sir Hugh Smithson's family. He adds not so ancient blood to your family. He was determined to prevent Smithson from inheriting any of the Percy lands and wished to make as his sole heir his grandson Sir Charles Wyndham, whose ancient family originated at Felbrigg Hall in Norfolk and had married into the nobility, for example his ancestor Sir John Wyndham had married Lady Margaret Howard, 4th daughter of John Howard, 1st Duke of Norfolk, KG, Earl Marshal. As part of his plan he petitioned the king to grant him the additional title of Earl of Northumberland, with special remainder to Wyndham. The plan was opposed by his son the future 7th Duke, who petitioned the king against, and succeeded at least in delaying the drawing up of the necessary letters patent. The 6th Duke died in 1748 before the letters patent were drawn up and the 7th Duke put into effect a similar scheme, which split the Percy inheritance between his own son-in-law Smithson and his late father's choice of heir, Sir Charles Wyndham. In accordance with the wishes of his father-in-law the 7th Duke, in 1750 Smithson changed his surname by Act of Parliament to Percy, adopted the Percy arms, and in 1766 was created Duke of Northumberland and Earl Percy.