He was the son of John Henry de la Poer Beresford, 5th Marquess of Waterford and Lady Blanche Elizabeth Adelaide Somerset. He was born on 28 April 1875. He married Lady Beatrix Frances Petty-FitzMaurice, daughter of Henry Charles Keith Petty-FitzMaurice, 5th Marquess of Lansdowne and Lady Maud Evelyn Hamilton, on 16 October 1897. They had six children. He died on 1 December 1911 at age 36.
Sources
England & Wales, Free BMD Birth Index, 1837-1915, Name Henry De La Poer (marquess of Waterford) Beresford Registration Year 1897 Registration Quarter Oct-Nov-Dec Registration district St George Hanover Square St George Hanover Square Inferred County London Volume 1a Page 889.
England & Wales, Free BMD Marriage Index, 1837-1915, Name Henry De La Poer (marquess of Waterford) Beresford Registration Year 1897 Registration Quarter Oct-Nov-Dec Registration district St George Hanover Square St George Hanover Square Inferred County London Volume 1a Page 889.
Ireland, Civil Registration Deaths Index, 1864-1958, Name H De La P Beresford Estimated Birth Year abt 1875 Date of Registration 1911 - Oct-Nov-Dec[1911] Death Age 36 Registration district Carrick-On-Suir Volume 4 Page 303 FHL Film Number 0101605.
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DNA Connections
It may be possible to confirm family relationships with Henry by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Henry: