He served as Bishop of Dromore from 1780 to 1782, Bishop of Ossory from 1782 to 1794, and as Archbishop of Tuam from 1794 until his death in 1819.
Lord Decies married on 16 June 1763 Elizabeth FitzGibbon (1732–1807), daughter of John FitzGibbon and wife Isabella Grove. They had eight children, three sons and five daughters:
Brig-Gen. Marcus Beresford (1764–1803)
Rev. John Beresford, 2nd Baron Decies (1773–1855)
Hon. Rev. George Beresford, married Susannah Gorges on 21 May 1798, and had issue, including Marcus Beresford
Hon. Rev. William Beresford (20 November 1780 – 27 June 1830), married Lady Anna Bennet, daughter of the 4th Earl of Tankerville, and had issue
Hon. Catherine Eleanor Beresford, married Rev. William Armstrong on 11 November 1789
Hon. Araminta Anne Beresford (d. 26 September 1816), married the Very Rev. Arthur John Preston on 26 May 1794
Hon. Harriet Beresford, married Thomas Henry Bermingham Daly Sewell on 25 January 1796, and had issue
Hon. Frances Beresford, married Col. Thomas Burrowes on 14 January 1797
Hon. Louisa de la Poer Beresford, married firstly Thomas Hope and was the mother of Henry Thomas Hope and Alexander Beresford Hope, and secondly her cousin William Carr Beresford, 1st Viscount Beresford.
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DNA Connections
It may be possible to confirm family relationships with William 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 William: