One hundred years ago, on 3 May 1921, the partition of Ireland became law in the British parliament. As the Marxist revolutionary, James Connolly, had predicted, partition created “a carnival of reaction both North and South”. It took years of terror, pogroms and bloodshed to establish what the first Prime Minister of Northern Ireland, James Craig, termed a “Protestant state for a Protestant people”. In the South, the newly established Free State was baptised in the blood of the Republicans who resisted the Treaty and partition.