History
Ireland was never part of the Roman Empire, and its Celtic society of small kingdoms was Christianised from the fifth century by missionaries associated with St Patrick. In the early medieval "Dark Ages," Irish monasteries were among Europe's great centres of learning and manuscript art. Viking raiders founded Dublin and other port towns, and the Normans invaded from 1169, beginning centuries of English and then British involvement.
English control tightened through plantations — the settlement of English and Scottish Protestants, especially in Ulster — the penal laws against Catholics, and the dispossession of Irish landowners. The Great Famine of 1845–52, caused by potato blight and worsened by British policy, killed around a million people and drove more than a million more to emigrate; the island's population fell by over a fifth in those years and kept falling for a century as emigration continued, creating a diaspora tens of millions strong. It has still not returned to its pre-famine level.
The 1916 Easter Rising and the War of Independence bracketed partition, enacted in May 1921 under the Government of Ireland Act 1920, and the Anglo-Irish Treaty signed that December, under which the 26 counties left the United Kingdom as the Irish Free State (a republic from 1949) while Northern Ireland remained in the United Kingdom. The Republic was poor and inward-looking for decades, then joined the European Community in 1973 and, in the 1990s and 2000s, boomed as the "Celtic Tiger" on the back of EU funds, education, low corporate tax, and US multinationals — crashing hard in 2008 before recovering. It has also transformed socially, legalising divorce, same-sex marriage, and abortion by referendum as the Catholic Church's authority collapsed amid abuse scandals.
- Ireland: The Island and the Nation — Passage tombs older than the Pyramids, a monastic golden age, eight centuries of English involvement, the Great Famine, a war of independence, partition, the Troubles, and a late, rapid transformation
