Earl Mansfield in Middlesex is in Earl Mansfield.
In 1792 William Murray 1st Earl Mansfield (age 86) was created 1st Earl Mansfield in Middlesex with a special remainder to his nephew David Murray 2nd Earl Mansfield (age 64). There was no such place as Mansfield in Middlesex; it was invented to differentiate it from the earlier Mansfield in Nottinghamshire creation.
On 20 Mar 1793 William Murray 1st Earl Mansfield (age 88) died. His nephew David Murray 2nd Earl Mansfield (age 65) succeeded 2nd Earl Mansfield in Middlesex. Louisa Cathcart 2nd Countess Mansfield (age 35) by marriage Countess Mansfield in Middlesex.
His niece-in-law Louisa Cathcart 2nd Countess Mansfield (age 35) succeeded 2nd Countess Mansfield in Nottinghamshire.
Baron Mansfield in Nottinghamshire extinct.
On 01 Sep 1796 David Murray 2nd Earl Mansfield (age 68) died. His son (age 19) succeeded 3rd Earl Mansfield in Middlesex, 8th Viscount Stormont.
On 16 Sep 1797 (age 20) and Frederica Markham Countess Mansfield (age 23) were married. She by marriage Countess Mansfield in Middlesex. She the daughter of Archbishop William Markham 1719-1807 (age 78). He the son of David Murray 2nd Earl Mansfield and Louisa Cathcart 2nd Countess Mansfield (age 39).
On 18 Feb 1840 (age 62) died. His son (age 33) succeeded 4th Earl Mansfield in Middlesex, 9th Viscount Stormont.
On 01 Aug 1898 (age 92) died. His grandson (age 38) succeeded 5th Earl Mansfield in Middlesex, 4th Earl Mansfield in Nottinghamshire, 10th Viscount Stormont.
On 29 Apr 1906 (age 45) died. His brother (age 42) succeeded 6th Earl Mansfield in Middlesex, 5th Earl Mansfield in Nottinghamshire, 11th Viscount Stormont.
In 1935 (age 71) died. His son (age 34) succeeded 7th Earl Mansfield in Middlesex, 6th Earl Mansfield in Nottinghamshire, 11th Viscount Stormont.
On 02 Sep 1971 (age 71) died. His son (age 41) succeeded 8th Earl Mansfield in Middlesex, 7th Earl Mansfield in Nottinghamshire, 12th Viscount Stormont.
On 21 Oct 2015 (age 85) died. His son (age 59) succeeded 9th Earl Mansfield in Middlesex, 8th Earl Mansfield in Nottinghamshire, 13th Viscount Stormont.