In the second half of the 18th century Robert Adam carried out many alterations, as did James Paine, Daniel Garrett and Capability Brown, all under the orders of the returning Percy family. Elizabeth Seymour and Hugh Smithson were elevated to 1st Duke and Duchess of Northumberland in 1766 by George III, whose restorations at Windsor Castle were partly inspired by the couple's work at Alnwick. The interiors were largely in a Strawberry Hill gothic style not at all typical of Adam's work, which was usually neoclassical, as seen at the Northumberlands' London home, Syon House.