List of prime ministers of Esthursia

• Top left: Neville Salisbury, commonly referred to as the "last aristocratic prime minister", served as a Conservative Prime Minister from 1911 to 1922.
• Top right: George Asmont was the longest serving prime minister and oversaw a lengthy period of international turmoil and internal reform, between 1926 and 1944.
• Bottom left: Edith Newell was the first female prime minister, the longest serving Reform Party prime minister and served between 1957 and 1969.
• Bottom right: Harold Osborne is the current prime minister, having been elected to the Social Democratic leadership in 2015, and then re-elected in 2018.

This article provides a list of prime ministers of Esthursia. The prime minister of Esthursia, although not an official office until 1957, was by convention the most senior baron within the largest party or coalition of parties able to form a government within the House of Barons. Until the 1930 general election, the House of Ministers served as the senior house, as the House of Barons was not elected before this date; and as such, the Prime Minister resided within the Ministry. George Asmont was the final Prime Minister to do this, having moved to the Barony after this election. The first Prime Minister to officially use this title was Jacob Banbury, in an 1885 treaty.

Sortable list of prime ministers (1835-present)

No.	Portrait	Name (Birth–Death)	Term of office			Party
			Took office	Left office	Time in office
Prime Minister of the Union of Esthursia
1		Howard Turnbrook (1777-1868)	19 March 1835	3 May 1836	1 year, 1 month and 14 days		Radical-Reformist
2		Philip Bolton (1788-1860)	3 May 1836	11 June 1847	11 years, 1 month and 8 days		Conservative Union
3		Graham Marling (1804-1886)	11 June 1847	12 March 1853	5 years, 9 months and 1 day		Reform Party
4		Henry Welwyn (1791-1877)	12 March 1853	17 April 1867	14 years, 1 month and 5 days		Reform Party
5		Edward Trent (1815-1884)	17 April 1867	28 November 1882	15 years, 7 months and 11 days		Conservative Union
6		Franklyn Waltham (1826-1904)	28 November 1882	7 August 1883	0 years, 8 months and 10 days		Conservative Union
7		Joseph Abingdon (1822-1897)	7 August 1883	15 January 1884	0 years, 5 months and 8 days		Conservative Union
8		Jacob Banbury (1837-1925)	15 January 1884	1 July 1893	9 years, 5 months and 16 days		Workers' Union
9		Wilber Smith-Jones (1855-1927)	1 July 1893	4 July 1901	7 years, 5 months and 3 days		Reform Party
10		Stephen Northcote (1848-1917)	4 December 1900	11 July 1911	10 years, 7 months and 7 days		Reform Party
11		Neville Salisbury (1855-1927)	11 July 1911	15 October 1922	11 years, 3 months and 4 days		Conservative Union
12		James Thorne (1858-1933)	15 October 1922	4 May 1926	3 years, 6 months and 19 days		Conservative Union
13		George Asmont (1882-1983)	4 May 1926	29 September 1944	18 years, 4 months and 25 days		Workers' Union
14		Philip Whittaker (1871-1958)	29 September 1944	4 April 1949	4 years, 6 months and 6 days		Workers' Union
15		Walter Wentworth (1897-1973)	4 April 1949	27 February 1950	0 years, 10 months and 23 days		Conservative Union
16		Olafn Arbjern (1893-1975)	27 February 1950	2 April 1957	7 years, 1 month and 6 days		National Party
17		Edith Newell (1908-2001)	2 April 1957	27 June 1969	12 years, 2 months and 25 days		Reform Party
18		Alfred Thwaite (1921-2009)	27 June 1969	2 March 1971	1 year, 8 months and 3 days		Reform Party
19 21		David Holmfirth (1935-present)	2 March 1971 2 April 1978	17 August 1974 4 April 1982	7 years, 5 months and 19 days		Social Democrats
20		Anthony Moore (1911-1988)	17 August 1974	2 April 1978	3 years, 7 months and 16 days		Conservative Union
22		William Greenwood (1919-1998)	4 April 1982	1 April 1990	7 years, 11 months and 28 days		Conservative Union
23		Martha Grantham (1929-2023)	4 April 1990	3 February 1999	8 years, 9 months and 30 days		Social Democrats
24		Mark Willesden (born 1948)	3 February 1999	7 April 2002	3 years, 2 months and 4 days		Social Democrats
25		Isaac Harding (born 1957)	7 April 2002	2 April 2009	6 years, 11 months and 26 days		Conservative Union
26		Tharbjorn Einarsson (born 1940)	2 April 2009	23 January 2011	1 year, 9 months and 21 days		Conservative Union
27		John Largan (born 1961)	23 January 2011	30 January 2015	4 years and 7 days		Social Democrats
28		Harold Osborne (born 1970)	30 January 2015	Incumbent	9 years, 9 months and 23 days		Social Democrats

Comprehensive list of prime ministers (1835-present)

Pre-Edwardian era (1835-1909)

No.	Portrait	Name (Birth–Death)	Term of office			Party		Elections	Ministry
			Took office	Left office	Time in office
Prime Minister of the Union of Esthursia
1		Howard Turnbrook (1777-1868)	19 March 1835	3 May 1836	1 year, 1 month and 14 days		Radical-Reformist	1835	Turnbrook I
2		Philip Bolton (1788-1860)	3 May 1836	11 June 1847	11 years, 1 month and 8 days		Conservative Union	1836	Bolton I
								1842	Bolton II
3		Graham Marling (1804-1886)	11 June 1847	12 March 1853	5 years, 9 months and 1 day		Reform Party	1847	Marling I
								1852	Marling II
4		Henry Welwyn (1791-1877)	12 March 1853	17 April 1867	14 years, 1 month and 5 days		Reform Party	—	Welwyn I
								1857	Welwyn II
								1862	Welwyn III
5		Edward Trent (1815-1884)	17 April 1867	28 November 1882	15 years, 7 months and 11 days		Conservative Union	1867	Trent I
								1872	Trent II
								1877	Trent III
								1882	Trent IV
6		Franklyn Waltham (1826-1904)	28 November 1882	7 August 1883	8 months and 10 days		Conservative Union	—	Waltham I
7		Joseph Abingdon (1822-1897)	7 August 1883	15 January 1884	5 months and 8 days		Conservative Union	—	Abingdon I
8		Jacob Banbury (1837-1925)	15 January 1884	1 July 1893	9 years, 5 months and 16 days		Workers' Union	January 1884	Banbury I
								1888	Banbury II
9		Wilber Smith-Jones (1855-1927)	1 July 1893	4 December 1900	7 years, 5 months and 3 days		Reform Party	1893	Smith-Jones I
								1898	Smith-Jones II
10		Stephen Northcote (1848-1917)	4 December 1900	11 July 1911	10 years, 7 months and 7 days		Reform Party	—	Northcote I
								1903	Northcote II
								1907	Northcote III

Edwardian era (1909–1949)

No.	Portrait	Name (Birth–Death)	Term of office			Party		Elections	Ministry
			Took office	Left office	Time in office
Prime Minister of the Union of Esthursia
11		Neville Salisbury (1855-1927)	11 July 1911	15 October 1922	11 years, 3 months and 4 days		Conservative Union	1911	Salisbury I
								1915	Salisbury II
								1919	Salisbury III
12		James Thorne (1858-1933)	15 October 1922	4 May 1926	3 years, 6 months and 19 days		Conservative Union	—	Thorne I
								1923	Thorne I
13		George Asmont (1882-1983)	4 May 1926	29 September 1944	18 years, 4 months and 25 days		Workers' Union	May 1926	Asmont I
								1929	Asmont II
								1933	Asmont III
								1937	Asmont IV
								1941	Asmont V
14		Philip Whittaker (1871-1958)	29 September 1944	4 April 1949	4 years, 6 months and 6 days		Workers' Union	—	Whittaker I
								1945	Whittaker I

Arthurian era (1949–present)

No.	Portrait	Name (Birth–Death)	Term of office			Party		Elections	Ministry
			Took office	Left office	Time in office
Prime Minister of the Union of Esthursia
15		Walter Wentworth (1897-1973)	4 April 1949	27 February 1950	10 months and 23 days		Conservative Union	1949	Wentworth I
16		Olafn Arbjern (1893-1975)	27 February 1950	2 April 1957	7 years, 1 month and 6 days		National Party	1950	Arbjern I
								1953	Arbjern II
17		Edith Newell (1908-2001)	2 April 1957	27 June 1968	11 years, 2 months and 25 days		Reform Party	1957	Newell I
								June 1959	Newell II
								1963	Newell III
								1967	Newell IV
18		Alfred Thwaite (1921-2009)	27 June 1969	2 March 1971	1 year, 8 months and 3 days		Reform Party	—	Thwaite I
19		David Holmfirth (1935-present)	2 March 1971	16 April 1975	4 years, 1 month and 14 days		Social Democrats	1971	Holmfirth I
20		Anthony Moore (1911-1988)	16 April 1975	8 March 1978	2 years, 10 months and 20 days		Conservative Union	1975	Moore I
21		David Holmfirth (1935-present)	8 March 1978	4 April 1982	4 years and 27 days		Social Democrats	March 1978	Holmfirth II
22		William Greenwood (1919-1998)	4 April 1982	1 April 1990	7 years, 11 months and 28 days		Conservative Union	April 1982	Greenwood I
								November 1982	Greenwood I
								1986	Greenwood II
23		Martha Grantham (1929-2023)	4 April 1990	3 February 1999	8 years, 9 months and 30 days		Social Democrats	1990	Grantham I
								1994	Grantham II
								1998	Grantham III
24		Mark Willesden (born 1948)	3 February 1999	7 April 2002	3 years, 2 months and 4 days		Social Democrats	—	Willesden I
25		Isaac Harding (born 1957)	7 April 2002	2 April 2009	6 years, 11 months and 26 days		Conservative Union	2002	Harding I
								2006	Harding II
26		Tharbjorn Einarsson (born 1940)	2 April 2009	23 January 2011	1 year, 9 months and 21 days		Conservative Union	—	Einarsson I
								2010	Einarsson II
									Einarsson III
27		John Largan (born 1961)	23 January 2011	30 January 2015	4 years and 7 days		Social Democrats	January 2011	Largan I
								2014	Largan II
28		Harold Osborne (born 1970)	30 January 2015	Incumbent	9 years, 9 months and 23 days		Social Democrats	—	Osborne I
								2018	Osborne II
								April 2022	Osborne III
								September 2022	Osborne IV

Timeline of Esthursian prime ministers