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Irish History Timeline

Ireland was largely covered by ice during much of the late Palaeolithic, or Old Stone Age, making long term human settlement unlikely. There is no clear evidence of sustained habitation during this period. The first widely accepted evidence of settlement begins around 8000 BC in the early Mesolithic period, after the last Ice Age ended.

8000BC to 4000BC – The Mesolithic Period

  • Also known as the Middle Stone Age.
  • Hunter gatherers arrive in Ireland, living by fishing, hunting and foraging.
  • Mount Sandel in Co. Derry is the earliest confirmed settlement.
  • Estimated population: approximately 5,000 people.

4000BC to 2500BC – The Neolithic Period

  • Also known as the New Stone Age.
  • Farming introduced to Ireland, transforming society and settlement patterns.
  • Large scale megalithic monuments built across Ireland, reflecting organised communities.
  • c. 3200 BC – Passage tombs of the Boyne Valley constructed, including Newgrange, Knowth and Dowth.
  • Estimated population: approximately 70,000 people.

2500BC to 600BC – The Bronze Age

  • Metallurgy introduced, beginning with copper and later bronze.
  • Ross Island, Co. Kerry one of Europe’s earliest copper mines.
  • Gold working flourished, especially in the Early Bronze Age, producing lunulae and torcs.
  • Development of hillforts and increased social hierarchy.
  • Estimated population: approximately 200,000 people.

600BC to 400AD – The Iron Age

  • Iron technology introduced, allowing stronger tools and weapons.
  • Celtic culture becomes established in Ireland.
  • Royal ceremonial sites such as Tara, Rathcroghan, Emain Macha and Dún Ailinne flourish.
  • Bog bodies from this period suggest ritual practices and possible kingship rites.
  • Estimated population: approximately 400,000 people.

Early Christian and Early Medieval Ireland (c. 400–1169)

  • Ireland becomes a network of kingdoms ruled by regional kings and High Kings.
  • 431 – Palladius sent to Ireland as a Christian missionary.
  • 433 – Saint Patrick lights the Paschal Fire on the Hill of Slane, symbolizing the arrival of Christianity in Ireland.
  • Monastic foundations flourish including Clonmacnoise, Glendalough and Monasterboice, becoming centres of learning and art.
  • 795 – First recorded Viking raid on the Irish coast.
  • c. 800 – Book of Kells created, masterpiece of early medieval Christian art.
  • 841 – Viking longphort established at Dublin, laying foundations for the city.
  • 1014 – Battle of Clontarf, where High King Brian Boru defeats a Viking led alliance.
  • 1142 – Mellifont Abbey established as Ireland’s first Cistercian foundation, introducing continental monastic reform.
  • Estimated population: approximately 750,000 people.

Medieval Ireland (1169–1534)

  • 1166 – Dermot MacMurrough expelled as King of Leinster, seeking support abroad.
  • 1169 – Anglo Norman invasion begins, altering Ireland’s political landscape.
  • 1171 – Henry II arrives in Ireland, asserting English royal authority.
  • Norman castles and towns established including Trim and Kilkenny.
  • 1315–1318 – Bruce Invasion, Edward Bruce attempts to become High King of Ireland.
  • 1348 – Black Death devastates towns and rural communities.
  • 1366 – Statutes of Kilkenny passed, attempting to prevent cultural integration.
  • Estimated population: around 1.5 million before the Black Death, falling to 1 million afterward.

Early Modern Ireland (1534–1691)

  • 1534 – Rebellion of Silken Thomas against English authority.
  • 1536–1541 – Dissolution of the Irish Monasteries: Under Henry VIII, monasteries were suppressed and their lands confiscated by the Crown.
  • 1541 – Henry VIII declared King of Ireland, beginning the Tudor conquest.
  • 1594–1603 – Nine Years’ War: United Gaelic revolt against English expansion in Ireland.
  • 1601 – Battle of Kinsale: Crushing defeat that marked the turning point in the conflict.
  • 1607 – Flight of the Earls: Departure of leading Gaelic nobles, ending the old political order.
  • 1609 – Plantation of Ulster: Organised settlement of English and Scottish Protestants in the north.
  • 1641 – Irish Rebellion, sparking a wider conflict across the islands.
  • 1649–1653 – Cromwellian campaign, marked by sieges, confiscations and population loss.
  • 1690 – Battle of the Boyne, where William III defeated James II during the Williamite War.
  • Estimated population: approximately 1.5 million around 1600, with significant decline by the 1650s, possibly under 1 million.

Protestant Ascendancy (1691–1801)

  • Penal Laws restrict Catholic political, religious and property rights.
  • 1759 – Guinness brewery founded in Dublin.
  • 1798 – United Irishmen Rebellion inspired by revolutionary ideas from America and France.
  • 1801 – Act of Union abolishes Irish Parliament and incorporates Ireland into the United Kingdom.
  • Estimated population: approximately 4.5 million by 1800.

19th Century

  • 1803 – Robert Emmet’s failed rebellion in Dublin.
  • 1829 – Catholic Emancipation grants most Catholics the right to sit in Parliament.
  • 1845–1852 – Great Famine caused by potato blight, leading to mass starvation and emigration.
  • 1867 – Fenian Rising, an unsuccessful nationalist rebellion.
  • 1879–1882 – Land War, campaign for tenant rights and land reform.
  • 1884 – Gaelic Athletic Association founded to promote Irish sports.
  • 1886–1914 – Home Rule movement seeks self government for Ireland within the United Kingdom.
  • 1893 – Gaelic League founded to revive the Irish language and culture.
  • Population: peaked at 8.2 million in 1841, fell to 6.5 million by 1851, and declined to about 4.5 million by 1901.

20th Century

  • 1913 – Dublin Lockout, major industrial dispute between workers and employers.
  • 1916 – Easter Rising, armed rebellion seeking Irish independence.
  • 1919–1921 – War of Independence, guerrilla conflict between the IRA and British forces.
  • 1920 – Government of Ireland Act partitions the island into Northern Ireland and Southern Ireland.
  • 1921 – Anglo Irish Treaty establishes the Irish Free State.
  • 1922–1923 – Civil War between pro and anti Treaty forces.
  • 1937 – New Constitution adopted, renaming the state Ireland.
  • 1949 – Republic of Ireland Act comes into effect, formally declaring Ireland a republic and ending the link with Britain.
  • 1955 – Ireland joins the United Nations.
  • 1967 – Civil Rights movement begins in Northern Ireland.
  • 1969–1998 – The Troubles: Conflict in Northern Ireland involving republican and loyalist paramilitaries and British security forces.
  • 1973 – Ireland joins the European Economic Community, later the European Union.
  • 1993 – Downing Street Declaration, key step in the peace process.
  • 1998 – Good Friday Agreement, peace settlement largely ending the Troubles.
  • Population: almost 6 million across the island by 2000.

21st Century

  • 2002 – Euro introduced as Ireland’s currency.
  • 2008–2013 – Financial crisis and EU IMF bailout following banking collapse.
  • 2011 – Queen Elizabeth II visits Ireland, first British monarch to do so since independence.
  • 2015 – Marriage Equality referendum legalises same sex marriage.
  • 2018 – Repeal of the Eighth Amendment allows abortion legislation.
  • 2020 – COVID 19 pandemic impacts public health and economy.
  • Population: now over 7 million across the island, approaching but still below the pre Famine peak of 8.2 million recorded in 1841.

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