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What were the origins of the partition of Ireland and when did it happen?

August 21, 2026 The Rest Is History

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In 1912, almost half a million Ulster unionists — led by Sir Edward Carson — signed a covenant pledging to use all means necessary to resist home rule from Dublin. A decade later, in 1922, a British-brokered treaty turned most of Ireland into a free state while allowing six counties in the northeast to remain a separate entity: Northern Ireland. That treaty drew the border that still exists today.

Half a million signatures — and a promise to resist by any means

At the start of the twentieth century, the island of Ireland held approximately four and a half million people. Three quarters were Catholic, one quarter Protestant — but that Protestant minority was concentrated heavily in the northeast, and it was fiercely opposed to any transfer of political authority to Dublin.

In 1912, that opposition crystallised into a mass mobilisation. Sir Edward Carson, the barrister and politician who became the face of Ulster unionism, led the movement that produced the Ulster Covenant. Close to half a million people put their names to a document pledging resistance to home rule by all means necessary. It was a remarkable show of force — and a direct warning to Westminster that partition, not accommodation, might be the only viable outcome.

This episode of The Rest Is History traces how that covenant set the political template for everything that followed — including the creation of Stormont and the formation of a distinct Northern Irish state under Sir James Craig.

The 1922 treaty: a free state for most, a carved-out northeast for the rest

The deal struck in 1922 was a compromise that satisfied almost nobody completely. Britain agreed to grant independence to the bulk of Ireland, which became the Irish Free State. But the six northeastern counties — Antrim, Armagh, Down, Fermanagh, Londonderry, and Tyrone — were permitted to opt out and form Northern Ireland, remaining within the United Kingdom.

The consequences were immediate and violent. Between the summer of 1920 and the summer of 1922, more than 500 people were killed in the north. Around 10,000 Catholics were driven from their jobs and 25,000 were forced from their homes. The border did not bring peace — it drew a line through communities that would spend the rest of the century living with the consequences, a history examined in depth in this episode of The Rest Is History.

"At the peak of the violence in the early 1970s, almost 500 people were being killed every year and a bomb was going off in Belfast every single day."

That statistic, cited in The Rest Is History, illustrates just how catastrophically the partition settlement eventually unravelled. The divisions locked in by the 1922 treaty would continue to generate violence for generations — from the 1935 Belfast riots (11 dead, 100 injured, 2,000 displaced) through to the full eruption of the Troubles five decades later.

Understanding the partition is inseparable from understanding the Troubles — the conflict that tore through Northern Irish society and drew in the IRA, Sinn Féin, the Royal Ulster Constabulary, the Ulster Volunteer Force, and figures from Ian Paisley to Lord Mountbatten. Tom Holland and his co-host unpack that full arc across the series, starting with the origins covered in this episode.