The Dublin Castle administration in Ireland was the government of Ireland under British rule from the twelfth century until 1922. Its chief executive was variously known as the Justicar, the Lord Deputy and, from the seventeenth century, the Lord Lieutenant of Ireland (also known as the Viceroy), who was both the English (pre-1707)/British government representative in Ireland and the personal representative in Ireland of the King. (11th century - 12th century - 13th century - other centuries) As a means of recording the passage of time, the 12th century was that century which lasted from 1101 to 1200. ... 1922 was a common year starting on Sunday (see link for calendar). ... (16th century - 17th century - 18th century - more centuries) As a means of recording the passage of time, the 17th century was that century which lasted from 1601-1700. ... Official standard of the Lord Lieutenant of Ireland The Lord Lieutenant of Ireland (also known as the Viceroy or in the Middle Ages as the Lord Deputy) was the head of Englands (pre-1707) or Britains (post 1707) administration in Ireland. ... Royal motto: Dieu et mon droit (French: God and my right) Englands location within the UK Official language English de facto Capital London de facto Largest city London Area  - Total Ranked 1st UK 130,395 km² Population  - Total (2001)  - Density Ranked 1st UK 49,138,831 377/km² Religion...

The Upper Courtyard of Dublin Castle. The Viceregal apartments are on the left.

By the nineteenth century the Lord Lieutenant had declined in importance vis-a-vis his chief aide, the Chief Secretary for Ireland. By the late nineteenth century the Lord Lieutenant might be, but was not always a member of the British cabinet, while the Chief Secretary invariably was. image of Dublin Castle - no copyright, I took the picture File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... image of Dublin Castle - no copyright, I took the picture File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Alternative meaning: Nineteenth Century (periodical) (18th century — 19th century — 20th century — more centuries) As a means of recording the passage of time, the 19th century was that century which lasted from 1801-1900 in the sense of the Gregorian calendar. ... The Chief Secretary was the most important position for determining Ireland after the Lord Lieutenant, and was frequently a cabinet level position in the 19th and early twentieth centuries. ...

Under the Government of Ireland Act, 1920 the Lord Lieutenant was scheduled to take up a new role, that of the King's representative to the two Irish states, Northern Ireland and Southern Ireland. However Southern Ireland never became a working reality and was replaced by the Irish Free State in 1922. The lord lieutenancy was abolished, with his Northern role given to the Governor of Northern Ireland. An Act to Provide for the Better Government of Ireland, more usually the Government of Ireland Act, 1920 (this is its official short title; the formal citation is 10 & 11 Geo. ... Northern Ireland is one of four constituent parts of the United Kingdom. ... Southern Ireland was the twenty-six county Irish state created in the Government of Ireland Act 1920. ... The Irish Free State (Irish: Saorstát Éireann) was (1922–1937) the name of the state comprising the 26 of Irelands 32 counties which were separated from the United Kingdom of Great Britain and Ireland under the Irish Free State Agreement (or Anglo-Irish Treaty) signed by British and Irish... 1922 was a common year starting on Sunday (see link for calendar). ... The Governor of Northern Ireland was the Crown representative in Northern Ireland. ...

Other major offices in the Dublin Castle administration — Chief Secretary, Under Secretary, Lord Chancellor of Ireland, Attorney-General for Ireland (which was scheduled to have been replaced anyway by the Attorney-General for Southern Ireland under the Government of Ireland Act), and the Solicitor-General for Ireland — were all abolished. The Chief Secretary's office evolved to form the administrative basis for the new President of the Executive Council of the Irish Free State (prime minister), with the Under Secretary's administrative role becoming that of the new chief civil servant in the Irish government, the Secretary to the Executive Council. The office of Lord Chancellor of Ireland was the highest judicial office in Ireland from earliest times until the establishment of the Irish Free State in 1922. ... The President of the Executive Council (Irish: Uachtaráin na hArd-Chomhairle) was the head of government or prime minister of the 1922-1937 Irish Free State, and the leader of the Executive Council (cabinet). ...