No formal "war between Britain and Ireland" exists. The relationship is defined by conquest, union, rebellion, and partition – not interstate war.
| Period | Nature | Key Events |
|---|---|---|
| 1169–1536 | Norman/English Lordship | Strongbow, Lordship of Ireland, Pale, Gaelic resurgence |
| 1536–1691 | Tudor/Stuart Conquest | Henry VIII "King of Ireland", Plantations, Nine Years' War, Cromwellian conquest |
| 1691–1800 | Protestant Ascendancy | Penal Laws, 1798 Rebellion (United Irishmen), French intervention |
| 1801–1922 | United Kingdom of Great Britain & Ireland | Act of Union, Catholic Emancipation (1829), Famine (1845–52), Land War, Home Rule crises |
| 1916–1921 | Revolutionary Period | Easter Rising, War of Independence (IRA vs Crown Forces), Anglo-Irish Treaty |
| 1922–present | Partition | Irish Free State → Republic (1949); Northern Ireland remains UK. Troubles (1968–98). |
Good Friday Agreement (1998) – consent principle, power-sharing, North-South bodies. UK & Ireland as sovereign partners (British-Irish Council).
Summary: Centuries of colonization, resistance, and partition – but never two recognized states at war.