Genealogy research by Mark Humphrys,
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John mar 2ndly to Elizabeth Gorges [dau of Very Rev. Robert Gorges, of Kilbrew, Co.Meath, Dean of Kilmacduagh].
If dau married 1821 he must have married 2ndly before 1804. (Or maybe she is dau by 1st mar.)
Rev. Conway Blennerhassett's will 1805 lists him as John Blennerhassett of Dublin, attorney.
John Blennerhassett, attorney, 23 Kildare St, Dublin, is listed in [Dublin Almanac, 1806].
He is "John Blennerhassett", attorney, who is party to Deed of 31 Mar 1806, relating to his sister Letitia.
He would be "John Blennerhasset", solicitor, with office at 2 Molesworth St, Dublin, who is listed in Freemans Journal, December 20, 1815.
In 1820 he had office at 27 Lower Mount St, Dublin.
His son had his grandson baptised at Monkstown in 1825, so maybe they already had the Monkstown house (see below) at this point, but the father lived in town.
John was living Mount St, near Merrion Square, Dublin, as at 1827.
His mother-in-law Mrs. Gorges died at his house on Mount St on 6 Mar 1827. See p.382 in the Gentleman's Magazine, Apr 1827.
[Case, 1852] says that "John Blennerhassett" (must be him) obtained a judgement in 1831 that his niece Louisa Ponsonby owed him £263. This was apparently not paid before her death in 1836.
Living 35 Holles Street, Dublin, as at dau's mar 1837.
Listed in [Dublin Almanac, 1838, p.29] at 35 Holles Street, Dublin.
He had issue by 2nd wife:
John mar 3rdly in 1841 to Frances Louisa Digby [dau of Richard Digby].
They mar by licence dated 1841, no issue.
He lived before 1842 (see map) and maybe as early as 1825 (see above) at a house he called "Blennerville" in Monkstown, Co.Dublin. Listed as "Blennerville" on 1829 to 1842 map. It was in Monpelier or Montpelier townland, Monkstown par (on the Monkstown side of Blackrock), Co.Dublin.
By 1843 the house in Monkstown was called "Greenville".
He is listed at "Greenville, Blackrock" in [Post Office Directory of Dublin, 1843, p.158]. Office in town at 4 Lower Merrion St.
He is listed at "Greenville" under Stradbrook in Blackrock in [Thom's, 1850 and 1852].
He is also listed at 5 Clare St, Dublin, in [Thom's, 1852].
[Case, 1852] shows him still pursuing the debt (see above) from the heirs of his niece Louisa Ponsonby.
"He was familiarly known among his professional brothers as "The Evergreen", because of the youthful appearance which he retained up to the termination of his long life" [1917 article].
He died 26 Feb 1855, at his house "Greenville".
See notice in Cork Examiner, 28 Feb 1855.
He was bur Carrickbrennan churchyard, Carrickbrennan Road, Monkstown (see street view).
Though list of grave readings at Carrickbrennan (see photos) has no Blennerhassett grave.
Will pr 28 Apr 1855.
See newspaper notice about his estate, 18 Dec 1855.
"Blennerville", Co.Dublin, on 1829 to 1842 map.
John Blennerhassett listed at "Greenville" under Stradbrook in Blackrock in [Thom's, 1852].
Bernard Martin is listed at "Greenville" in [Thom's, 1868].
Signatures of "John Blennerhassett", attorney, in Deed of 1806.
Clearly the same person.
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