Arthur was born to Arthur and "Olivia Whitemore Guinness," in Beaumont, County Dublin, Ireland, on March 12, 1768.
Arthur Guinness II took over management of the family brewery.
Occupants of 33 Parnell Square
1817 - Arthur Guinness (1768-1855) of James's Gate and Beaumont, Artane. He bought the house in 1819 from the executors of Denis O'Brien (his son Arthur of Upper Gardiner Street, and Marie O'Brien, spinster of Rahan Lodge, King's Co.). He became his Father's partner and, in 1803, his main successor and, in fact if not in name, the head of the family. Shrewd, forthright and immensely able, he served in the Farming Society of Ireland, the Dublin Ballast Office, the Ouzel Galley Society, the Meath Hospital, the Dublin Chamber of Commerce and other bodies. A director of the Bank Of Ireland, his main interest after 1815 was in banking.
His wife, Anne, daughter of Benjamin Lee of Merrion died here on 21st February 1817. His brother, Edward (1772-1833), a solicitor, lived in No.2 Granby Row. This house is included in the property mentioned in the marriage settlement of Arthur's son, Reverend William Smyth Guinness (1795- 1864), Vicar and Rector of Rathdrum, Co. Wicklow, and Susan Jane, daughter of Benjamin Guinness of Eccles Street, who were married in St. George's, Hardwicke Place on 9th March 1826.
Marriage 14 June 1761 St. Mary, Dublin, County Dublin, Ireland
Fact: Burial Mount Jerome Cemetery and Crematorium , Dublin, County Dublin, Ireland
↑ Find A Grave, database and images (https://www.findagrave.com : accessed 05 October 2019), memorial page for Arthur Guinness, II (12 Mar 1768–9 Jun 1855), Find A Grave Memorial no. 184968377, citing Mount Jerome Cemetery and Crematorium, Dublin, County Dublin, Ireland ; Maintained by Collins Crapo (contributor 669) . 
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It may be possible to confirm family relationships with Arthur 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 (beta) of DNA with Arthur: