Richard FitzWilliam, 6th Viscount FitzWilliam (24 July 1711 - 25 May 1776), KB, PC, FRS, of Mount Merrion, near Dublin, Ireland, was an Anglo-Irish peer and property developer.
On 3 May 1744, he married Catherine Decker, eldest daughter and co-heiress of Sir Matthew Decker, 1st Baronet, a wealthy merchant of Dutch origin, by his wife Henrietta Watkins, at Sir Matthew's house in St James's Square.[2]Horace Walpole thought the marriage notable enough to mention in his correspondence.[3] By Catherine he had issue including:
Richard FitzWilliam, 7th Viscount FitzWilliam (c. 22 August 1745 - 1816), eldest son and heir, who inherited the Decker mansion and art collection at Richmond and died unmarried and without legitimate issue; by his will, he founded the Fitzwilliam Museum in Cambridge.
William Fitzwilliam, (c. 18 September 1749 Richmond - pre-1816)[citation needed]
John FitzWilliam, 8th Viscount Fitzwilliam, (c.21 Oct 1752 Richmond – 1830)
Thomas FitzWilliam, 9th Viscount Fitzwilliam (c.3 September 1755 Richmond - January 1833) [4]
Henrietta FitzWilliam, (c. 16 October 1746 Richmond - )[citation needed]
Mary FitzWilliam, (c. 20 August 1748, Richmond - )[citation needed]
Hon. Catherine FitzWilliam, (c.30 Oct 1753 Richmond - )
Death
Lord FitzWilliam died on 25 May 1776 at Mount Merrion and was buried at Donnybrook Cemetery.
References
^"Fellows details". Royal Society. Retrieved 16 February 2019.
^The Register of Marriages in the Parish of St James within the Liberty of Westminster. 1723-1754. 3 May 1744.
^Letters of Horace Walpole, Earl of Orford, to Sir Horace Mann Richard Bentley London 1833 Vol. 2 p.12
^Sir Bernard Burke (1866). A genealogical history of the dormant, abeyant, forfeited, and extinct peerages of the British empire. Harrison.