Four Courts in the context of "Circuit Court (Ireland)"

The Courts of Ireland consist of the Supreme Court, the Court of Appeal, the High Court, the Circuit Court, the District Court and the Special Criminal Court. With the exception of the Special Criminal Court, all courts exercise both civil and criminal jurisdiction, although when the High Court is exercising its criminal jurisdiction it is known as the Central Criminal Court.

The courts apply the laws of Ireland. There are four sources of law in Ireland: the Constitution, European Union law, statute law and the common law. Under the Constitution, trials for serious offences must usually be held before a jury. Except in exceptional circumstances, court hearings must occur in public. The High Court, the Court of Appeal, and the Supreme Court have authority, by means of judicial review, to determine the compatibility of the common law and statute law with the Constitution. Similarly, the courts may determine the compatibility of the common law with statute law.

The 1841 Census of Ireland was a census that covered the whole island of Ireland. It was conducted as part of the broader 1841 United Kingdom census, which was the first modern census undertaken in the UK. The census is of particular note in Ireland as it was taken shortly before the Great Famine (1845–1852), which resulted in over 1 million deaths and spurred decades of mass emigration. The total population of the island in 1841 was estimated to be just under 8.2 million, which remains the highest recorded population Ireland has ever had. During this year, Ireland also held about 31% of the UK's population. As of the latest censuses – 2022 in the Republic of Ireland and 2021 in Northern Ireland – the island's population stood at just over 7 million, roughly 16% lower than its pre-famine peak.

The original records of the 1821 to 1851 censuses were destroyed by fire at the Four Courts in Dublin during the Irish Civil War, while those between 1861 and 1891 were possibly pulped during the First World War.

The Supreme Court of Ireland (Irish: Cúirt Uachtarach na hÉireann) is the highest judicial authority in Ireland. It is a court of final appeal and exercises, in conjunction with the Court of Appeal and the High Court, judicial review over Acts of the Oireachtas (Irish parliament). The Supreme Court also has appellate jurisdiction to ensure compliance with the Constitution of Ireland by governmental bodies and private citizens. It sits in the Four Courts in Dublin.

The National Army, sometimes unofficially referred to as the Free State Army or the Regulars, was the army of the Irish Free State from January 1922 until October 1924. Its role in this period was defined by its service in the Irish Civil War, in defence of the institutions established by the Anglo-Irish Treaty. Michael Collins was the army's first commander-in-chief until his death in August 1922.

The army made its first public appearance on 31 January 1922, when command of Beggars Bush Barracks was handed over from the British Army. Its first troops were the Pro-Treaty IRA—those volunteers of the Irish Republican Army (IRA) who supported the Anglo-Irish Treaty and the "Provisional Government of Ireland" formed thereunder. Conflict arose between the National Army and those that opposed the government of the Irish Free State namely the anti-Treaty components of the IRA. On 28 June 1922 the National Army commenced an artillery bombardment of anti-Treaty IRA forces who were occupying the Four Courts in Dublin, thus beginning the Irish Civil War.

The Battle of Dublin was a week of street battles in Dublin from 28 June to 5 July 1922 that marked the beginning of the Irish Civil War. Six months after the Anglo-Irish Treaty ended the recent Irish War of Independence, it was fought between the forces of the new Provisional Government and a section of the Irish Republican Army (IRA) that opposed the Treaty.

The Irish Citizen Army also became involved in the battle, having supported the anti-Treaty IRA in the O'Connell Street area. The fighting began with an assault by Provisional Government forces on the Four Courts building, and ended in a decisive victory for the Provisional Government.