The Court of King's Bench (or Court of Queen's Bench during the reign of a Queen) was one of the senior courts of common law in Ireland. It was a mirror of the Court of King's Bench in England. The Lord Chief Justice was the most senior judge in the court, and the second most senior Irish judge under English rule and later when Ireland became part of the United Kingdom. Additionally, for a brief period between 1922 and 1924, the Lord Chief Justice of Ireland was the most senior judge in the Irish Free State.
The office was created during the Lordship of Ireland (1171–1536) and continued in existence under the Kingdom of Ireland (1536–1800) and the United Kingdom of Great Britain and Ireland. Prior to the Supreme Court of Judicature Act (Ireland) 1877, the Lord Chief Justice presided over the Court of King's/Queen's Bench, and as such ranked foremost amongst the judges sitting at common law. After 1877, the Lord Chief Justice assumed the presidency of the Queen's Bench Division of the new High Court of Justice, which sat permanently in the Four Courts in Dublin.
Thomas Lefroy, later Lord Chief Justice of Ireland (LCJ 1852–1866), was used by Jane Austen as the model for her Pride and Prejudice character Mr. Darcy. Lefroy and Austen had had a romance in their youths. Other prominent Lord Chief Justices of Ireland include Lord Whiteside (LCJ 1866–1876), who as a Queen's Counsel had defended Irish nationalist leader Daniel O'Connell in court, Gerald FitzGerald, 3rd Earl of Desmond, Hugh de Lacy, Risteárd de Tiúit, John Dougherty and Thomas Marlay, James Ley and Peter O'Brien. James Henry Mussen Campbell, 1st Baron Glenavy (LCJ 1916–1918, later Chairman of Seanad Éireann and grandfather of the satirist Patrick Campbell). One Lord Chief Justice, Lord Kilwarden, was killed by a crowd during Robert Emmet's 1803 rebellion.