By 1707, when Grimsthorpe was illustrated in
Britannia Illustrata, the
15th Baron Willoughby de Eresby and 3rd Earl Lindsey had rebuilt the north front of Grimsthorpe in the classical style. However, in 1715,
Robert Bertie, the 16th Baron Willoughby de Eresby, employed
Sir John Vanbrugh to design a
Baroque front to the house to celebrate his ennoblement as the first
Duke of Ancaster and Kesteven. It is Vanbrugh's last masterpiece. He also prepared designs for the reconstruction of the other three ranges of the house, but they were not carried out. His proposed elevation for the south front was in the
Palladian style, which was just coming into fashion, and is quite different from all of his built designs. , drawn in 1819. Vanbrugh's Stone Hall occupies the space between the columns on both floors. Inside, the Vanbrugh hall is monumental with stone arcades all around at two levels. Arcaded screens at each end of the hall separate the hall from staircases, much like those at
Audley End House and
Castle Howard. The staircase is behind the hall screen and leads to the staterooms on the first floor. The State Dining Room occupies Vanbrugh's north-east tower, with its painted ceiling lit by a
Venetian window. It contains the throne used by
George IV at his Coronation Banquet, and a Regency giltwood throne and footstool used by
Queen Victoria in the old House of Lords. There is also a walnut and
parcel gilt chair and footstool made for the use of
George III at Westminster. The King James and State Drawing Rooms have been redecorated over the centuries, and contain portraits by Reynolds and Van Dyck, European furniture, and yellow Soho Tapestries woven by Joshua Morris around 1730. The South Corridor contains thrones used by
Prince Albert and
Edward VII, as well as the desk on which Queen Victoria signed her coronation oath. A series of rooms follows in the Tudor east range, with recessed
oriel windows and ornate ceilings. The Chinese drawing room has a splendidly rich ceiling and an 18th-century fan-vaulted oriel window. The walls are hung with Chinese wallpaper depicting birds amidst bamboo. The chapel is magnificent with superb 17th-century plasterwork. ==The park==