'Mahon1'Index links to: Lead / Letter
Families covered: Mahon of Castlegar

We think it likely that this Mahon family descended from the early O'Mahony family which is given on Mahony01.
Bryan Mahon of Loughrea (d 03.1695)
m. Magdalen Power of Rathroddy (d 02.1703)
1. James Mahon (d 04.1716)
  m. (c09.1672) Alice Cullen (dau of Thomas Cullen of Oughtercloony)
A. Bryan Mahon of Oughtercloony or Beech Hill (dsp 1731-2)
  B. Thomas Mahon ancestor of Mahon of Beech Hill
  m. Bridget Gaynor (dau of Ross Gaynor of Black Castle)
2. Bryan Mahon of Castlegar (d 30.10.1719)
  m. (1693) Ellinor Gaynor (dau of Ross Gaynor of Black Castle)
A. Ross Mahon of Castlegar (bur 10.04.1767)
  m. (c12.1721) Jane Ussher (bpt 17.02.1693-4, d 1768, dau of John Ussher of Mount Ussher by Alice Molyneux)
  i. Ross Mahon of Castlegar (b 1725, d 17.03.1788)
  m. (12.10.1762) Anne Browne (d 21.02.1815,dau of John Browne, 1st Earl of Altamont)
  a. Sir Ross Mahon, 1st Bart of Castlegar (b 02.09.1763, d 10.08.1835)
  m1. (08.1786) Elizabeth Browne (d 24.02.1795, dau of Peter Browne, 2nd Earl of Altamont)
  (1) Elizabeth Louisa Mahon (d 11.02.1847)
  m. (25.09.1806) John Cator of Beckenham Place (d 20.08.1858)
  (2) Anne Charlotte Mahon (dsp 1833)
  m. (23.04.1822) Rawdon Griffith Greee (d 28.12.1862, vicar of Stillorgan)
  (3) Charlotte Mahon (d 09.08.1865)
  m. (01.07.1813) John Henry Blakeney of Abbert (d 17.11.1858)
(4)+ other issue - Charlotte (d infant), Maria Elizabeth (d unm 26.03.1848)
  m2. (19.09.1805) Diana Baber (dsp 02.12.1807, dau of Edward Baber of London)
  m3. (01.10.1809) Mary Geraldine FitzGerald (d 20.03.1859, dau of James FitzGerald of Inchicronan)
  (6)+ Sir Ross (b 18.07.1811, d unm 05.04.1842, 2nd Bart), Sir James FitzGerald Ross (b 03.06.1812, d unm 11.03.1852, 3rd Bart), Sir William Vesey Ross (b 14.07.1813, m 12.10.1853, d 14.08.1893, 4th Bart, had issue), John Denis Ross (b 09.05.1814, d unm 05.06.1887), Henry Ross (b 03.01.1819, d unm 20.07.1899), Catherine Geraldine (m 08.06.1842, dsp 05.03.1890), Letitia Anne (m 01.09.1843, d 30.07.1892), Emily Jane (d unm 19.02.1887), Henrietta Louisa (m 04.12.1845, d 10.12.1893), Georgina (m1 12.11.1851, m2 08.02.1866, dsp 28.07.1897), Jane Alicia (m 17.07.1855, d 13.06.1907), Caroline (m 06.05.1857, d 09.08.1913)
  b. John Mahon of Besborough (b 24.11.1764, d 23.10.1834)
  m. Charlotte Browne (d 23.01.1849, dau of Peter Browne, 2nd Earl of Altamont)
(1) Elizabeth Mahon (d 26.02.1863)
  m. (28.12.1814) Arthur Annesley, later Grove-Annesley of Ballyhimmock (d 07.11.1849, Lt. General)
  c. Henry Mahon of Killegally (b 25.02.1771, d 29.07.1838, rector of Tessauran, 4th son) had issue
  m. (23.07.1802) Anne Symes (d 12.05.1818, dau of Rev. Abraham Symes of Hillbrook)
  d. James Mahon (b 20.04.1774, d 20.03.1837, Dean of Tuam then Dromore) had issue
  m. (01.10.1812) Frances Catherine Ker (d 21.10.1868, dau of David Ker of Portavo and Montalto)
  e. George Mahon of Mount Pleasant (b 07.1778, d 01.05.1843, 7th son) had issue
  m. (09.08.1813) Sophia Ker (d 06.12.1844, dau of David Ker of Portavo and Montalto)
f. Anne Mahon (d 30.12.1833)
  m. (09.12.1790) Denis Browne (d 14.08.1828, son of 2nd Earl of Altamont)
  g. Harriet Mahon (d 03.11.1840)
  m. (28.07.1793) Annesley Gore Knox of Rappa Castle (b 11.01.1768, d 04.07.1839)
  h. Emily Mahon
  m. (30.09.1796) Thomas William Filgate of Arthurstown, Sheriff (d 17.11.1846)
  i.+ other issue (d unm) - George (b 02.05.1766, d infant), Charles (b 09.1776, d young), Jane (d 21.09.1856), Louisa (d infant)
  ii. Alice Mahon (d 09.1769)
  m. (06.11.1748) John King of Ballylin (d 11.1778)
  iii.+ other issue - John (b c1727, d unm 1785), Ussher (d young), 2 daughters (d young)
  B. Mary Mahon
  m. (02.1719) William Kelly of Mucklon (d 14.07.1746)
  C. Elizabeth Mahon
  m. Thomas Tully of Rafarn (d 1741)
  D. Hester Mahon
  m1. (1729) _ Molyneux (d before 11.1733)
  m2. (1736-7) Edward Forster (son of Captain Francis of Clooneene or Ashfield)
  E.+ other issue - James of Ballyglass (d unm 08.1752), Peter of Dublin (d unm 1734), Alice, Ellinor

Main source(s): BP1934 (Mahon)
Back to top of page