By the nineteenth century, the Lord Lieutenant was declining in importance by comparison with his chief aide, the Chief Secretary for Ireland: the British cabinet would invariably include the Chief Secretary, but only sometimes the Lord Lieutenant.
Just as the Civil Service ("His Majesty's Home Civil Service") evolved from the officials of the various government departments around Whitehall in London, so the corresponding officials in Dublin evolved into the Irish civil service. The Irish Office in London [citation needed] was the part of the British civil service which liaised with Dublin Castle, just as the Colonial Office liaised with colonial governments. After the Partition of Ireland, most Irish civil servants transferred to either the Civil Service of the Irish Free State or the Civil Service of Northern Ireland. Those based in the Free State who were unsympathetic to the new regime were allowed to retire early on reduced pension.
McBride, Lawrence W. (1991). The Greening of Dublin Castle: the transformation of bureaucratic and judicial personnel in Ireland, 1892-1922. Catholic University of America Press. ISBN9780813207155.
McCarthy, Denis; Benton, David (2004). Dublin Castle: at the heart of Irish History. Dublin: Stationery Office. ISBN9780755719754.
McDowell, R. B. [Robert Brendan] (1964). The Irish Administration, 1801–1914. Studies in Irish History. Vol. s2 v2. Routledge & Kegan Paul; University of Toronto Press. OCLC906125229 – via Internet Archive.
Sturgis, Mark; Coogan, Tim Pat (1999). Hopkinson, Michael (ed.). The last days of Dublin Castle: the Mark Sturgis diaries. Irish Academic Press. ISBN9780716526261.