His forename is unknown but his surname was used for some of the children of his niece Mary Welbank who m. William Trotter; probably this was in honour of his wife, her blood aunt.
There are loads of Sampson deaths on FreeBMD so I have no idea which might have been him or even if he died after 1837. Harriet’s death cert might give his forename as might an early census.
Paul Welbank on his Welbank site <
www.welbank.net> asserts that his full name was William Sampson, all confirmed by finding the marriage record on FindMyPast.
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He was found in the 1841 census but not in 1851. Probably he died between those years.
But FindMyPast still has 107 William Sampsons who died in that period in London.
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But his will was found and clearly idenifies him, his wife and Robert Welbank. It was proved on 14th November 1850 so he would have died shortly before that.
This reduces the death search to 11 people in 1850 in London.
In view of the Eaton Square address that he mentions in his will, This looks like his death:
Name: Age at Death (in years):
SAMPSON, WILLIAM 74
GRO Reference: 1850 D Quarter in SAINT GEORGE HANOVER SQUARE Volume 01 Page 2
And this gives an approximate birth year of 1776.
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He signed his will on 30th August 1848 and died in Quarter 4 of 1850.
He left a simple will reciting that he was ‘of Copthall Court in the City of London, York Place, marylebone but now of New Broad Street London and of Eaton Square Westminster’.
He made minor legacies to:
his sister Harriet Eleanor Sampson,
his brother-in-law Robert Welbank,
his nieve Mary Elizabeth Brown wife of William Brown,
his business partner Thomas Cooke,
The remainder of his estate was to go to his wife harriet.
and some clauses about:
‘ the beloved child of my adoption and of my warmest affection Mary Elizabeth Brown in full confidence that my dear wife’s equal affection for the said niece will prompt her to be liberal and kind to her and to her ????
This proves that he and Harriet adopted Mary Elizabeth who by then was the only survivor of George and Ann Welbank’s two children.