The area now known as Northern Ireland has had a diverse history. From serving as the bedrock of Irish resistance in the era of the plantations of Queen Elizabeth and James I in other parts of Ireland, it became the subject of major planting of Scottish and English settlers after the Flight of the Earls in 1607 (when the Gaelic aristocracy fled to Catholic Europe).

The all-island Kingdom of Ireland (1541—1800) merged into the United Kingdom of Great Britain and Ireland in 1801 under the terms of the Act of Union, under which the kingdoms of Ireland and Great Britain merged under a government and monarchy based in London