On 03 Oct 1771 [her father] Armar Lowry-Corry 1st Earl Belmore (age 31) and Margaret Butler (age 23) were married. She by marriage Countess Belmore in the County of Fermanagh.

On 02 Mar 1780 [her father] Armar Lowry-Corry 1st Earl Belmore (age 39) and [her mother] Harriet Hobart Viscountess Belmore (age 17) were married. She by marriage Countess Belmore in the County of Fermanagh. The difference in their ages was 22 years. She the daughter of John Hobart 2nd Earl Buckinghamshire (age 56) and Mary Anne Drury Countess Buckinghamshire.

On 04 Apr 1793 [her step-father] William Kerr 6th Marquess Lothian (age 29) and [her mother] Harriet Hobart Viscountess Belmore (age 30) were married. She the daughter of John Hobart 2nd Earl Buckinghamshire (age 69) and Mary Anne Drury Countess Buckinghamshire. He the son of William John Kerr 5th Marquess Lothian (age 56) and Elizabeth Fortescue 5th Marchioness Lothian. He a great x 5 grandson of King James I of England and Ireland and VI of Scotland.

On 01 Mar 1794 [her father] Armar Lowry-Corry 1st Earl Belmore (age 53) and [her step-mother] Mary Anne Caldwell Countess Belmore (age 38) were married. She by marriage Viscountess Belmore of Fermanagh.

After 03 May 1798 William James Comte d'Arran (age 20) and [her future sister-in-law] Henrietta Susanah Montagu (age 20) were married. She the daughter of John Montagu 5th Earl Sandwich (age 54) and Maria Henrietta Powlett. He a great x 2 grandson of King Charles II of England Scotland and Ireland.

On 09 Jul 1804 George Montagu 6th Earl Sandwich (age 31) and Louisa Lowry-Corry Countess of Sandwich (age 23) were married. She the daughter of Armar Lowry-Corry 1st Earl Belmore and Harriet Hobart Viscountess Belmore (age 42). He the son of John Montagu 5th Earl Sandwich (age 60) and Maria Henrietta Powlett.

On 12 Apr 1823 [her son-in-law] Bingham Baring 2nd Baron Ashburton (age 23) and [her daughter] Harriet Mary Montagu Baroness Ashburton (age 17) were married. She the daughter of George Montagu 6th Earl Sandwich and Louisa Lowry-Corry Countess of Sandwich (age 42).

Before Oct 1824 John Upton 2nd Baron Templetown (age 52) and [her former sister-in-law] Mary Montagu (age 50) were married. She by marriage Viscountess Templetown in Antrim. She the daughter of John Montagu 5th Earl Sandwich and Maria Henrietta Powlett.

On 01 Dec 1831 [her son-in-law] Alexandre Florian Joseph Count Colonna-Walewski (age 21) and [her daughter] Catherine Caroline Montagu Countess Colonna-Walewski (age 23) were married. She the daughter of George Montagu 6th Earl Sandwich and Louisa Lowry-Corry Countess of Sandwich (age 50).

On 06 Sep 1838 [her son] John William Montagu 7th Earl Sandwich (age 26) and [her daughter-in-law] Mary Paget Countess Sandwich (age 26) were married. She by marriage Countess Sandwich. She the daughter of Henry William Paget 1st Marquess Anglesey (age 70) and Charlotte Cadogan Marchioness Anglesey (age 57). He the son of George Montagu 6th Earl Sandwich and Louisa Lowry-Corry Countess of Sandwich (age 57).