Bonhams is to offer the contents of Glyn Cywarch, the Welsh seat of Jasset Ormsby Gore, the 7th Baron Harlech. The Contents of Glyn Cywarch – the property of Lord Harlech will take place at Bonhams, New Bond Street, London on 29 March 2017. The sale comprises more than 400 items ranging from important furniture, Old Master paintings, a historic library, antique jewellery, silver and works of art and even a vintage motor car and motorcycle.

The sale is being held to raise funds for the restoration of Glyn Cywarch (known as Glyn) which Lord Harlech inherited on the death of his father in February 2016. As he explains, "Bonhams' sale provides us with an exciting opportunity to realise important funds to help restore this historic house back to its magnificent best."

Lord Harlech has put his career in film production on hold to concentrate on Glyn. "Just as my family collected fine art and antiques over the generations, it now feels the right time to find a new generation of collectors to enjoy them, as we undertake the important job of looking after Glyn. It's a big undertaking, but we'll get it done."

Among the leading items in the sale are:

• A set of seven George III giltwood framed open armchairs in the manner of Robert Adam with 18th century gros and petit point needlework upholstered backs arms and seats each illustrating a different Aesop fable. (£50,000-80,000).

• A historic library including books personally inscribed by Jackie Kennedy attesting to the family's close friendship with President John F. Kennedy.

• Daniel Quigley (British, early 18th century) 'The Godolphin Arabian' – the horse that fathered the modern thoroughbred bloodstock, extensively inscribed with history of the stallion and its offspring, £15,000-20,000

• A rare pair of late 16th/early 17th century oak three-tier buffets, circa 1600 estimated at (£35,000-45,000).

• Painting by Jan Frans van Bloemen called Orizonte. A Classical Landscape with Three Figures Seated Conversing, Two Men Fishing in the River, an Idealised Town and Mountain Landscape Beyond (£25,000-35,000)

• A 'barn find' 1936 Lagonda Rapier 1,098 cc sports tourer (£20,000-25,000)

• A diamond riviere necklace set with 56 old cushion-cut diamonds and a 19th century
diamond set pendant. (£18,000-22,000)