Gibside is a country estate, set amongst the peaks and slopes of the Derwent Valley, between Rowlands Gill, Tyne and Wear and Burnopfield, North East England. Gibside was previously owned by the Bowes-Lyon family. It is now a National Trust property. The main house on the estate is now a shell, although the property is most famous for its chapel. The stables, walled garden and Banqueting House are also intact.
The Blakiston family acquired the estate by marriage in about 1540. Sir William Blakiston (1562–1641) replaced the old house with a spacious mansion between 1603 and 1620. Both the Royal (King James I of England) coat of arms and the Blakiston coat of arms are seen over the entrance of the old Hall. The Gibside property came into the possession of the Bowes family in 1713; a result of the marriage between Sir William's great granddaughter, Elizabeth Blakiston, to Sir William Bowes (1657–1707) of Streatlam Castle (now demolished) in 1693.
Until 1722, the basis of the Bowes' influence was their own estate and castle of Streatlam. However after that date, the acquisition through marriage of the Blakiston estate gave the Bowes family an even greater influence in the north of the county and a share in the immense wealth that was to be acquired from the coal trade. The Blakiston estate included some of the area's richest coal seams.
In 1767, the granddaughter of Sir William Bowes – the "Bowes heiress" Mary Eleanor Bowes – married John Lyon, 9th Earl of Strathmore and Kinghorne, who changed his surname to Bowes due to a provision in her father's will that any suitor had to take the family name. This was a device to continue the Bowes lineage in the absence of a male heir.
Improvements to Gibside carried out by the Bowes-Lyon family included landscaping in the 18th century, a chapel (Gibside Chapel, built between 1760 and 1812), a banqueting hall, a column of Liberty, an avenue of oaks and several hundred acres of forest.
Gibside differs from many estates in that the main house, although grand, was not the focal point of the estate. The long walk actually runs from the Column of Liberty to the chapel and the mansion is located to one side. The house became vacant in the 1920s after death duties forced the Bowes-Lyon family to scale back its lavish lifestyle and give up some of its great houses. The building was stripped of its fixtures and fittings, with many of the fireplaces and other items being transferred to Glamis Castle. Parts of the structure were demolished in 1958, including the removal of the roof, and the remains are protected by Grade II listed building status.
Parts of the grounds have been designated a Site of Special Scientific Interest, including a forest garden that is currently under restoration. There are several outstanding buildings, including a Palladian chapel and others awaiting or undergoing restoration.
The chapel and Grand Walk have been in the National Trust's ownership since 1965 and an additional 354 acres (1.43 km2) of the grounds were acquired in 1993. The Banqueting House has been in the ownership of the Landmark Trust since 1981, the building having been restored from a derelict shell.
Land army girls were billeted at Gibside during World War I.
Queen Elizabeth The Queen Mother – a direct descendent of Sir William Blakiston and thus the great great great granddaughter of Mary Eleanor Bowes – had fond memories of Gibside. During her youth, she had enjoyed trips with her father, Claude Bowes-Lyon, 14th Earl of Strathmore and Kinghorne to the estate, which was owned by her family. Both she and her husband, the Duke of York (later King George VI), visited the estate a number of times, the first time in July 1936 and the last being in 1968 when, as the Queen Mother, she made a private visit to the Gibside Chapel.
It was reported in 2014 that the direct ancestor of Catherine, Duchess of Cambridge, was Sir Thomas Blakiston Conyers, 9th Baronet (d.1810), who was the great great great grandson of Sir William Blakiston (d.1641) of Gibside. The Duchess and the Queen Mother - the great great great granddaughter of Mary Eleanor Bowes - are thus distant blood cousins; their common ancestor being Sir William Blakiston. In 1800, Sir Thomas Conyers had attended the funeral of his cousin Mary Eleanor Bowes at Westminster Abbey. 
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- "D/St/C 2: Catalogue - Estate and family records - correspondence - letters (and replies) - of Ernest Kirkup RE, visit of Duke and Duchess of York to Gibside, July 28, 1936. - Strathmore and Gibside estates: Bowes-Lyon". Durham County Record Office and Darlington. 1961. Retrieved 4 November 2011.
- Toole, Anthony (1 October 2012). "The Queen Mother's Playground; Gibside Hall, Tyne & Wear". Countryfile. BBC. Retrieved 23 October 2013.
- "Fond Memories of Gibside Visits". Evening Chronicle. 1 April 2002. Retrieved 20 October 2013.
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- "Duchess of Cambridge shares Queen Mother's County Durham ancestor according to new research". Northern Echo - 8 December 2014. Retrieved 6 March 2016.
Kate's direct ancestor, Sir Thomas Blakiston Conyers, also attended the funeral of his Gibside cousin Mary Bowes, Countess of Strathmore and Kinghorne, who was the Queen Mother's great-great-great-grandmother and considered to be the wealthiest woman in England at the time of her death in 1800
- Parring, Rebecca. "Proof Kate Middleton IS related to Queen Mother: Duchess to view cabinet proving ancestry". UK Daily Express, 8 December 2014. Retrieved 7 February 2015.
Mr Reed said: "It makes sense that Kate wore the Queen Mother's tiara when she married Prince William - both women share a great deal, Durham ancestry, the vast Gibside Estate and the same famous cabinet."
- Cliffe, Martha. "Kate really was destined for royalty! The Duchess of Cambridge shares an ancestor with the late Queen Mother historian reveals". UK Daily Mail, 9 December 2014. Retrieved 7 February 2015.
- "Kate Middleton and Queen Elizabeth the Queen Mother related". Australian Woman's Weekly - 9 December 2014. Retrieved 6 March 2016.
- Surtees, Robert (July 1809). "Letter". Illustrations of Horace - Sir Thomas Conyers. Gentleman's Magazine and Historical Review. 79.2. pp. 1110–11.
- Burke, Sir Bernard (1860). A Second Series of Vicissitudes of Families. Longman, Green, Longman and Roberts. p. 19. Retrieved 30 November 2013.
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