On 14 Apr 1794 [her father] Thomas Thynne 2nd Marquess of Bath (age 29) and [her mother] Isabella Elizabeth Byng Marchioness Bath 1773-1830 (age 20) were married. He the son of Thomas Thynne 1st Marquess of Bath (age 59) and Elizabeth Bentinck Marchioness Bath 1735-1825 (age 58).
On 19 Nov 1796 [her grandfather] Thomas Thynne 1st Marquess of Bath (age 62) died. His son [her father] Thomas Thynne 2nd Marquess of Bath (age 31) succeeded 2nd Marquess of Bath, 4th Viscount Weymouth, 5th Baronet Thynne of Kempsford in Gloucestershire. [her mother] Isabella Elizabeth Byng Marchioness Bath 1773-1830 (age 23) by marriage Marchioness of Bath.
On 25 Mar 1801 Louisa Thynne Countess Harewood was born to Thomas Thynne 2nd Marquess of Bath (age 36) and Isabella Elizabeth Byng Marchioness Bath 1773-1830 (age 27).
On 14 May 1823 [her future brother-in-law] William Lascelles (age 24) and Caroline Georgiana Howard (age 19) were married. She the daughter of George Howard 6th Earl Carlisle 1773-1848 (age 49) and Georgiana Cavendish Countess Carlisle 1783-1858 (age 39). He the son of Henry Lascelles 2nd Earl Harewood 1767-1841 (age 55) and .
On 05 Jul 1823 Henry Lascelles 3rd Earl Harewood (age 26) and Louisa Thynne Countess Harewood (age 22) were married. She the daughter of Thomas Thynne 2nd Marquess of Bath (age 58) and Isabella Elizabeth Byng Marchioness Bath 1773-1830 (age 49). He the son of Henry Lascelles 2nd Earl Harewood 1767-1841 (age 55) and .
On 18 Jun 1824 [her son] Henry Thynne Lascelles 4th Earl Harewood 1824-1892 was born to [her husband] Henry Lascelles 3rd Earl Harewood (age 27) and Louisa Thynne Countess Harewood (age 23).
In 1825 [her son] Egremont William Lascelles was born to [her husband] Henry Lascelles 3rd Earl Harewood (age 27) and Louisa Thynne Countess Harewood (age 23).
In 1826 [her son] George Edwin Lascelles was born to [her husband] Henry Lascelles 3rd Earl Harewood (age 28) and Louisa Thynne Countess Harewood (age 24).
On 16 Jun 1827 Edward Berkeley Fitzharding 1st Viscount Portman (age 27) and [her sister-in-law] Emma Lascelles Baroness Portman (age 18) were married. She the daughter of Henry Lascelles 2nd Earl Harewood 1767-1841 (age 59) and .
In 1828 [her son] Algernon Francis Lascelles was born to [her husband] Henry Lascelles 3rd Earl Harewood (age 30) and Louisa Thynne Countess Harewood (age 26).
In 1829 [her son] Alfred Lascelles was born to [her husband] Henry Lascelles 3rd Earl Harewood (age 31) and Louisa Thynne Countess Harewood (age 27).
In 1830 [her daughter] Louisa Isabella Lascelles Baroness Hillingdon was born to [her husband] Henry Lascelles 3rd Earl Harewood (age 32) and Louisa Thynne Countess Harewood (age 28).
On 01 May 1830 [her mother] Isabella Elizabeth Byng Marchioness Bath 1773-1830 (age 56) died. Monument in Saints Peter and Paul Church, Longbridge Deverill [Map]. Probably sculpted by Francis Leggatt Chantrey (age 49).
In 1831 [her son] James Walter Lascelles was born to [her husband] Henry Lascelles 3rd Earl Harewood (age 33) and Louisa Thynne Countess Harewood (age 29).
In 1834 [her daughter] Susan Charlotte Lascelles Countess Wharncliffe 1834-1927 was born to [her husband] Henry Lascelles 3rd Earl Harewood (age 36) and Louisa Thynne Countess Harewood (age 32).
On 18 Nov 1834 [her brother-in-law] Arthur Lascelles (age 27) and Caroline Frances Brooke were married. He the son of Henry Lascelles 2nd Earl Harewood 1767-1841 (age 66) and .
In 1835 [her son] Horace Douglas Lascelles was born to [her husband] Henry Lascelles 3rd Earl Harewood (age 37) and Louisa Thynne Countess Harewood (age 33).
In 1837 [her daughter] Blanche Emma Lascelles Countess Shannon 1837-1863 was born to [her husband] Henry Lascelles 3rd Earl Harewood (age 39) and Louisa Thynne Countess Harewood (age 35).
On 27 Mar 1837 [her father] Thomas Thynne 2nd Marquess of Bath (age 72) died. His son [her brother] Henry Frederick Thynne 3rd Marquess of Bath 1797-1837 (age 39) succeeded 3rd Marquess of Bath, 5th Viscount Weymouth, 6th Baronet Thynne of Kempsford in Gloucestershire. Harriet Baring Marchioness Bath 1804-1892 (age 32) by marriage Marchioness of Bath. Monument in Saints Peter and Paul Church, Longbridge Deverill [Map] sculpted by Francis Leggatt Chantrey (age 55).
In 1838 [her daughter] Florence Harriet Lascelles was born to [her husband] Henry Lascelles 3rd Earl Harewood (age 40) and Louisa Thynne Countess Harewood (age 36).
On 17 Dec 1839 [her brother-in-law] Edward Lascelles (age 43) died.
On 24 Nov 1841 [her father-in-law] Henry Lascelles 2nd Earl Harewood 1767-1841 (age 73) died. His son [her husband] Henry Lascelles 3rd Earl Harewood (age 44) succeeded 3rd Earl Harewood in Yorkshire, 3rd Viscount Lascelles, 3rd Baron Harewood of Harewood in Yorkshire. Louisa Thynne Countess Harewood (age 40) by marriage Countess Harewood in Yorkshire.
Around 1843 [her daughter] Mary Elizabeth Lascelles was born to [her husband] Henry Lascelles 3rd Earl Harewood (age 45) and Louisa Thynne Countess Harewood (age 41).
In 1845 [her son] Algernon Francis Lascelles (age 17) died.
In 1845 [her son] Alfred Lascelles (age 16) died.
On 17 Jul 1845 [her son] Henry Thynne Lascelles 4th Earl Harewood 1824-1892 (age 21) and [her daughter-in-law] Elizabeth Joanna Burgh (age 19) were married. She the daughter of Ulick Burgh 1st Marquess Clanricarde 1802-1874 (age 42) and (age 41). He the son of Henry Lascelles 3rd Earl Harewood (age 48) and Louisa Thynne Countess Harewood 1801-1859 (age 44).
In 1846 [her daughter] Maud Caroline Lascelles was born to [her husband] Henry Lascelles 3rd Earl Harewood (age 48) and Louisa Thynne Countess Harewood (age 44).
On 02 Jul 1851 [her brother-in-law] William Lascelles (age 52) died.
On 21 Jul 1851 [her son] George Edwin Lascelles (age 25) and [her daughter-in-law] Louisa Nina Murray (age 13) were married. She the daughter of (age 45) and Louisa Ellison. He the son of Henry Lascelles 3rd Earl Harewood (age 54) and Louisa Thynne Countess Harewood 1801-1859 (age 50).
In 1853 [her son-in-law] Charles Mills 1st Baron Hillingdon (age 22) and [her daughter] Louisa Isabella Lascelles Baroness Hillingdon (age 23) were married. She the daughter of Henry Lascelles 3rd Earl Harewood (age 55) and Louisa Thynne Countess Harewood 1801-1859 (age 51).
In 1855 [her son-in-law] Edward Stuart-Wortley-Mackenzie 1st Earl Wharncliffe (age 27) and [her daughter] Susan Charlotte Lascelles Countess Wharncliffe 1834-1927 (age 21) were married. She the daughter of Henry Lascelles 3rd Earl Harewood (age 57) and Louisa Thynne Countess Harewood 1801-1859 (age 53).
On 06 Dec 1855 [her sister-in-law] Frances Anne Lascelles died.
On 22 Feb 1857 [her husband] Henry Lascelles 3rd Earl Harewood (age 59) died. His son [her son] Henry Thynne Lascelles 4th Earl Harewood 1824-1892 (age 32) succeeded 4th Earl Harewood in Yorkshire, 4th Viscount Lascelles, 4th Baron Harewood of Harewood in Yorkshire.
On 21 Apr 1858 [her son] Henry Thynne Lascelles 4th Earl Harewood 1824-1892 (age 33) and [her daughter-in-law] (age 20) were married. She by marriage Countess Harewood in Yorkshire. He the son of Henry Lascelles 3rd Earl Harewood and Louisa Thynne Countess Harewood 1801-1859 (age 57). She a great x 5 granddaughter of King James II of England Scotland and Ireland.
On 12 Jul 1859 [her son-in-law] Henry Bentinck Boyle 5th Earl Shannon 1833-1890 (age 25) and [her daughter] Blanche Emma Lascelles Countess Shannon 1837-1863 (age 22) were married. She the daughter of Henry Lascelles 3rd Earl Harewood and Louisa Thynne Countess Harewood 1801-1859 (age 58). He the son of Richard Boyle 4th Earl Shannon 1809-1868 (age 50) and Emily Henrietta Seymour-Conway Countess Shannon. He a great x 4 grandson of King Charles II of England Scotland and Ireland. 
On 07 Nov 1859 Louisa Thynne Countess Harewood (age 58) died.
George Henry Cavendish and Louisa Lascelles were married. She the daughter of Henry Lascelles 2nd Earl Harewood 1767-1841 and .
Paternal Family Tree: Thynne
Maternal Family Tree: Lucy Boyle Viscountess Torrington
Kings Wessex: Great x 23 Grand Daughter of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 19 Grand Daughter of Owain "Great" King Gwynedd 1100-1170
Kings Seisyllwg: Great x 25 Grand Daughter of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 20 Grand Daughter of Maredudd ap Bleddyn King Powys 1047-1132
Kings England: Great x 11 Grand Daughter of King Edward IV of England
Kings Scotland: Great x 18 Grand Daughter of William "Lion" I King Scotland
Kings Franks: Great x 19 Grand Daughter of Louis VII King Franks
Kings France: Great x 14 Grand Daughter of Charles "Beloved Mad" VI King France
Great x 4 Grandfather: Henry Thynne 1st Baronet 9 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Henry Frederick Thynne 10 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Mary Coventry Lady Thynne Kempsford
Great x 2 Grandfather: Thomas Thynne 11 x Great Grand Son of King Edward III of England
Great x 1 Grandfather: Thomas Thynne 2nd Viscount Weymouth 12 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Edward Villiers
9 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Edward Villiers 1st Earl Jersey 10 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Frances Howard 9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Mary Villiers Baroness Lansdowne 11 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: William Chiffinch
GrandFather: Thomas Thynne 1st Marquess of Bath 9 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: Philip Carteret
13 x Great Grand Son of King Henry III of England
Great x 3 Grandfather: George Carteret 1st Baron Carteret 12 x Great Grand Son of King Edward "Longshanks" I of England
Great x 4 Grandmother: Jemima Montagu
11 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 2 Grandfather: John Carteret 2nd Earl Granville 13 x Great Grand Son of King Edward "Longshanks" I of England
Great x 4 Grandfather: John Granville 1st Earl Bath
Great x 3 Grandmother: Jane Granville Baroness Gower 1654-1744
Great x 4 Grandmother: Jane Wyche
Great x 1 Grandmother: Louisa Carteret Viscountess Weymouth 8 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: Robert Worsley 3rd Baronet 8 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Robert Worsley 4th Baronet 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Mary Herbert Countess Gainsborough -1693
9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Frances Worsley Countess Granville 1693-1743 7 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: Thomas Thynne 1st Viscount Weymouth 10 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Frances Thynne 6 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandmother: Frances Finch Viscountess Weymouth
5 x Great Grand Daughter of King Henry VII of England and Ireland
Father: Thomas Thynne 2nd Marquess of Bath 10 x Great Grand Son of King Edward IV of England
Great x 3 Grandfather: William Bentinck 1st Earl of Portland
Great x 2 Grandfather: Henry Bentinck 1st Duke Portland 1682-1726 11 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Edward Villiers 9 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Anne Villiers Countess Portland 1651-1688 10 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Frances Howard 9 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: William Bentinck 2nd Duke Portland 1709-1762 11 x Great Grand Son of Henry IV King England
Great x 4 Grandfather: Edward Noel 1st Earl Gainsborough
Great x 3 Grandfather: Wriothesley Baptist Noel 2nd Earl Gainsborough 1661-1690 9 x Great Grand Son of Henry IV King England
Great x 4 Grandmother: Elizabeth Wriothesley Countess Gainsborough
8 x Great Grand Daughter of Henry IV King England
Great x 2 Grandmother: Elizabeth Noel Duchess Portland 1688-1737 10 x Great Grand Daughter of Henry IV King England
Great x 4 Grandfather: Fulke Greville 5th Baron Brooke
9 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Catherine Greville Duchess Buckingham and Normandby 10 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Sarah Dashwood Baroness Brooke
GrandMother: Elizabeth Bentinck Marchioness Bath 1735-1825 9 x Great Grand Daughter of King Edward IV of England
Great x 4 Grandfather: Edward Harley 9 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Robert Harley 1st Earl of Oxford and Earl Mortimer 10 x Great Grand Son of King Edward III of England
Great x 2 Grandfather: Edward Harley 2nd Earl of Oxford and Earl Mortimer 11 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Thomas Foley
Great x 3 Grandmother: Elizabeth Foley Countess of Oxford and Mortimer
Great x 1 Grandmother: Margaret Cavendish Harley 2nd Duchess Portland 1715-1785 8 x Great Grand Daughter of King Edward IV of England
Great x 4 Grandfather: Gilbert Holles 3rd Earl de Clare 1633-1689 8 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: John Holles 1st Duke Newcastle upon Tyne 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Grace Pierrepont Countess de Clare 1633-1702
9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Henrietta Cavendish Holles Countess of Oxford and Mortimer 1694-1755 7 x Great Grand Daughter of King Edward IV of England
Great x 4 Grandfather: Henry Cavendish 2nd Duke Newcastle upon Tyne 5 x Great Grand Son of King Edward IV of England
Great x 3 Grandmother: Margaret Cavendish Duchess Newcastle upon Tyne 1661-1716 6 x Great Grand Daughter of King Edward IV of England
Great x 4 Grandmother: Frances Pierrepont Duchess Newcastle upon Tyne 1630-1695 9 x Great Grand Daughter of King Edward III of England
Louisa Thynne Countess Harewood 1801-1859 11 x Great Grand Daughter of King Edward IV of England
Great x 2 Grandfather: George Byng 1st Viscount Torrington
Great x 1 Grandfather: George Byng 3rd Viscount Torrington
GrandFather: George Byng 4th Viscount Torrington
Mother: Isabella Elizabeth Byng Marchioness Bath 1773-1830 10 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: Roger Boyle 1st Earl Orrery
Great x 3 Grandfather: Roger Boyle 2nd Earl Orrery 1646-1692 10 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Margaret Howard Countess Orrery 1622-1689 9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Charles Boyle 4th Earl Cork 4th Earl Orrery 1674-1731 11 x Great Grand Son of King Edward III of England
Great x 1 Grandfather: John Boyle 5th Earl Cork 1707-1762 8 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: John Cecil 4th Earl Exeter 1628-1678
5 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: John Cecil 5th Earl Exeter 1648-1700 6 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandmother: Frances Manners Countess Exeter 1630-1660
8 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Elizabeth Cecil Countess Cork 1691-1708 7 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: William Cavendish 3rd Earl Devonshire 10 x Great Grand Son of King Edward "Longshanks" I of England
Great x 3 Grandmother: Anne Cavendish Countess Exeter 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Elizabeth Cecil Countess Devonshire 1619-1689 8 x Great Grand Daughter of King Edward III of England
GrandMother: Lucy Boyle Viscountess Torrington 9 x Great Grand Daughter of King Henry VII of England and Ireland
