On 24th July 1753 [her father] Charles Cathcart 9th Lord Cathcart [aged 32] and [her mother] Jane Hamilton [aged 26] were married. They had nine children.
In 1758 Louisa Cathcart 2nd Countess Mansfield was born to Charles Cathcart 9th Lord Cathcart [aged 36] and Jane Hamilton [aged 31].
On 16th August 1759 David Murray 2nd Earl Mansfield [aged 31] and Henrietta Frederica von Bünau were married.
On 13th November 1771 [her mother] Jane Hamilton [aged 45] died.
In 1776 William Murray 1st Earl Mansfield [aged 70] was created 1st Earl Mansfield in Nottinghamshire with a special remainder to Louisa Cathcart 2nd Countess Mansfield [aged 18] the second wife of his nephew David Murray [aged 48].
On 5th May 1776 David Murray 2nd Earl Mansfield [aged 48] and Louisa Cathcart 2nd Countess Mansfield [aged 18] were married. The difference in their ages was 30 years.
On 14th August 1776 [her father] Charles Cathcart 9th Lord Cathcart [aged 55] died.
On 7th March 1777 [her son] David William Murray 3rd Earl of Mansfield was born to David Murray 2nd Earl Mansfield [aged 49] and Louisa Cathcart 2nd Countess Mansfield [aged 19]. He married 16th September 1797 Frederica Markham Countess Mansfield, daughter of Archbishop William Markham, and had issue.
On 19th October 1777 Robert Fulke Greville [aged 26] and Louisa Cathcart 2nd Countess Mansfield [aged 19] were married. He the son of Francis Greville 1st Earl Brooke Warwick Castle 1st Earl Warwick and Elizabeth Hamilton Countess Brooke Warwick Castle and Warwick [aged 57]. They were half first cousins.
On 10th December 1785 George Finch-Hatton [aged 38] and [her step-daughter] Elizabeth Murray [aged 25] were married. She the daughter of [her husband] David Murray 2nd Earl Mansfield [aged 58] and Henrietta Frederica von Bünau.
On 26th December 1790 [her sister] Jane Cathcart [aged 36] died.
On 20th March 1793 William Murray 1st Earl Mansfield [aged 88] died. Baron Mansfield in Nottinghamshire extinct. His nephew David [aged 65] succeeded 2nd Earl Mansfield in Middlesex. Louisa Cathcart 2nd Countess Mansfield [aged 35] by marriage Countess Mansfield in Middlesex. His niece-in-law Louisa Cathcart 2nd Countess Mansfield succeeded 2nd Countess Mansfield in Nottinghamshire.
On 1st September 1796 David Murray 2nd Earl Mansfield [aged 68] died. His son David [aged 19] succeeded 3rd Earl Mansfield in Middlesex, 8th Viscount Stormont.
On 16th September 1797 David William Murray 3rd Earl of Mansfield [aged 20] and Frederica Markham Countess Mansfield [aged 23] were married. She by marriage Countess Mansfield in Middlesex. She the daughter of Archbishop William Markham [aged 78]. He the son of David Murray 2nd Earl Mansfield and Louisa Cathcart 2nd Countess Mansfield [aged 39].
In 1816 George Greville 2nd Earl Warwick and Brooke [aged 69] died. His son Henry [aged 36] succeeded 3rd Earl Warwick, 3rd Earl Brooke Warwick Castle, 10th Baron Brooke of Beauchamps Court in Warwickshire.
On 27th April 1824 [her husband] Robert Fulke Greville [aged 73] died.
On 15th December 1825 [her son-in-law] Reverend Daniel Heneage Finch-Hatton [aged 30] and Louisa Greville were married. She the daughter of Robert Fulke Greville and Louisa Cathcart 2nd Countess Mansfield [aged 67].
On 18th February 1840 David William Murray 3rd Earl of Mansfield [aged 62] died. His son William [aged 33] succeeded 4th Earl Mansfield in Middlesex, 9th Viscount Stormont.
On 11th July 1843 Louisa Cathcart 2nd Countess Mansfield [aged 85] died. Her grandson [her grandson] William [aged 37] succeeded 3rd Earl Mansfield in Nottinghamshire.
[her daughter] Louisa Greville was born to Robert Fulke Greville and Louisa Cathcart 2nd Countess Mansfield. Coefficient of inbreeding 3.15%. She married 15th December 1825 Reverend Daniel Heneage Finch-Hatton and had issue.
Kings Wessex: Great x 20 Grand Daughter of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 17 Grand Daughter of Owain "Great" King Gwynedd
Kings Seisyllwg: Great x 23 Grand Daughter of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 18 Grand Daughter of Maredudd ap Bleddyn King Powys
Kings Godwinson: Great x 21 Grand Daughter of King Harold II of England
Kings England: Great x 11 Grand Daughter of King Edward III of England
Kings Scotland: Great x 7 Grand Daughter of King James IV of Scotland
Kings France: Great x 13 Grand Daughter of King Philip IV of France
Kings Duke Aquitaine: Great x 25 Grand Daughter of Ranulf I Duke Aquitaine
Kings Spain: Great x 17 Grand Daughter of Alfonso VII King Castile VII King Leon
Father: Charles Cathcart 9th Lord Cathcart
Louisa Cathcart 2nd Countess Mansfield 7 x Great Granddaughter of King James IV of Scotland
Great x 4 Grandfather: William Douglas 9th Earl Angus
5 x Great Grandson of King Robert III of Scotland
Great x 3 Grandfather: William Douglas 10th Earl Angus
2 x Great Grandson of King James IV of Scotland
Great x 4 Grandmother: Egidia Graham Countess of Angus
Great Granddaughter of King James IV of Scotland
Great x 2 Grandfather: William Douglas 1st Marquess Douglas
3 x Great Grandson of King James IV of Scotland
Great x 4 Grandfather: Laurence Oliphant 4th Lord Oliphant 6 x Great Grandson of King Robert II of Scotland
Great x 3 Grandmother: Elizabeth Oliphant Countess Angus 4 x Great Granddaughter of King James I of Scotland
Great x 4 Grandmother: Margaret Hay Lady Oliphant
3 x Great Granddaughter of King James I of Scotland
Great x 1 Grandfather: William Hamilton 1st Duke Hamilton
4 x Great Grandson of King James IV of Scotland
Great x 4 Grandfather: George Gordon 5th Earl Huntley Great Grandson of King James IV of Scotland
Great x 3 Grandfather: George Gordon 1st Marquess Huntly 2 x Great Grandson of King James IV of Scotland
Great x 4 Grandmother: Anne Hamilton Countess Huntley Great Granddaughter of King James IV of Scotland
Great x 2 Grandmother: Mary Gordon Marchioness Douglas 3 x Great Granddaughter of King James IV of Scotland
Great x 4 Grandfather: Esme Stewart 1st Duke Lennox 3 x Great Grandson of King James II of Scotland
Great x 3 Grandmother: Henrietta Stewart Marchioness Huntly
4 x Great Granddaughter of King James II of Scotland
Great x 4 Grandmother: Catherine Balsac Duchess Lennox
Grandfather: Archibald Hamilton
5 x Great Grandson of King James IV of Scotland
Great x 4 Grandfather: John Hamilton 1st Marquess Hamilton Great Grandson of King James IV of Scotland
Great x 3 Grandfather: James Hamilton 2nd Marquess Hamilton 2 x Great Grandson of King James IV of Scotland
Great x 4 Grandmother: Margaret Lyon Marchioness Hamilton 3 x Great Granddaughter of King James I of Scotland
Great x 2 Grandfather: James Hamilton 1st Duke Hamilton 3 x Great Grandson of King James IV of Scotland
Great x 4 Grandfather: James Cunningham 7th Earl Glencairn 3 x Great Grandson of King James II of Scotland
Great x 3 Grandmother: Ann Cunningham Marchioness Hamilton 4 x Great Granddaughter of King James II of Scotland
Great x 1 Grandmother: Anne Hamilton 3rd Duchess Hamilton 4 x Great Granddaughter of King James IV of Scotland
Great x 4 Grandfather: Basil Feilding of Newnham Paddock in Monk's Kirby in Warwickshire
Great x 3 Grandfather: William Feilding 1st Earl Denbigh
Great x 4 Grandmother: Elizabeth Aston
Great x 2 Grandmother: Margaret aka Mary Feilding
9 x Great Granddaughter of King Edward III of England
Great x 4 Grandfather: George Villiers of Brokesby
Great x 3 Grandmother: Susan Villiers Countess Denbigh
8 x Great Granddaughter of King Edward III of England
Great x 4 Grandmother: Mary Beaumont 1st Countess Buckingham
7 x Great Granddaughter of King Edward III of England
Mother: Jane Hamilton
6 x Great Granddaughter of King James IV of Scotland