The Great Famine Kills Roughly a Million People
Potato blight destroys the staple crop of the rural poor, and starvation and emigration empty the island
Quick facts
- Period
- 1845-1852
- Cause
- Potato blight, Phytophthora infestans
- Estimated deaths
- c. 1 million
- Emigration
- 1-2 million in the famine's broader aftermath
What happened
Starting in 1845, a fungal blight, Phytophthora infestans, destroyed successive potato harvests across Ireland, wiping out the staple food of millions of rural poor who depended on the crop almost entirely. The failure recurred over several seasons through 1852, and, combined with continued food exports, inadequate relief efforts, and disease that spread through weakened and displaced populations, the resulting famine became, in the words of Ireland's National Famine Museum, the single greatest social disaster of 19th-century Europe. Roughly one million people died of starvation and related disease, and at least another million emigrated within a few years to escape the crisis, with one to two million leaving the island in the famine's broader aftermath. Ireland's population fell from close to 8.4 million in 1844 to about 6.6 million by 1851, a drop of roughly a quarter, with some towns losing as much as 60 percent of their population. Estate records from Strokestown Park in County Roscommon, now home to the National Famine Museum, document this in granular detail, including tenant petitions describing families slowly starving in the presence of a resident landlord.
Why it matters
The Famine permanently altered Ireland's demography, reducing its population by a quarter within a decade and setting off a century of sustained emigration that built enormous Irish diaspora communities in North America, Britain, and Australia, while cementing lasting grievance over British government relief policy during the crisis.
How we know
Death and emigration figures come from 19th-century census records, contemporary relief administration reports, and estate archives such as the Strokestown Park collection, now held by Ireland's National Famine Museum, which preserves tenant correspondence and landlord records documenting the crisis in detail.
Sources
- Strokestown Park, National Famine Museum. National Famine Museum · General sourcestrokestownpark.ie · Cited as a "reference" source (no stronger domain match). · Link is live and its text matches the event's key terms (Jul 2026)
- History.com. Irish Potato Famine · Reputable sourcehistory.com · The domain "history.com" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
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