The mind behind the world’s first successful C-section, the scientist who helped explain why the sky is blue, and the physician who inspired the creation of milk chocolate were all Irish people who revolutionized the world, but whom you’ve probably never heard of.

Ireland has been the birthplace of many figures who have left their mark on history. Oscar Wilde, James Joyce, and W.B. Yeats are renowned for their revolutionary literary works.
Still, other lesser-known Irish figures have also had a profound impact through their world-changing contributions in science, medicine, and international politics.
Here are the five most influential Irish people you’ve probably never heard of, but should have!
5. Jane Wilde (Speranza) – revolutionary poet and feminist

Oscar Wilde’s famous works, such as The Picture of Dorian Gray (1890) or The Importance of Being Earnest (1895), are widely known. However, his mother, Jane Wilde, was an equally talented and revolutionary poet and a fervent advocate for women’s rights and Irish nationalism.
Her fiery poems, such as The Brothers, published in The Nation newspaper, inspired a generation of Irish nationalists. She wrote under the pseudonym “Speranza” and hosted one of Dublin’s most famous literary salons.
Her work left an impact on Irish society long after she died in 1896, and was an important precursor to the Irish literary revival led by W. B. Yeats.
4. Hans Sloane – introduced chocolate milk to Europe

Sloane is the Irish-born physician responsible for our addiction to milk chocolate. His work led him to Jamaica, where he tried the local cocoa-based drink. He found the taste nauseating, and he decided to combine it with milk.
Upon his return to England, he sold the recipe to apothecaries as medicine. His recipe later inspired the development of milk chocolate, which was then popularised by Cadbury!
3. John Tyndall – one of the pioneers of climate studies

John Tyndall was a prominent 19th-century Irish physicist. His revolutionary research led to scientific discoveries, such as the scattering of light by small particles suspended in the atmosphere, which helped explain why the sky is blue! This discovery is also known as the Tyndall Effect.
Tyndall was also one of the first scientists to identify the gases responsible for trapping heat in Earth’s atmosphere, laying the foundation for modern climate science. This explains why several international institutes dedicated to climate change are named after him.
2. Ernest Walton – first person to split the atom

Ernest Walton was an Irish experimental physicist and academic. He was the first person in history to split the atom artificially!
His work with John Cockcroft on the transmutation of atomic nuclei led to a Nobel Prize in Physics, making him Ireland’s only Nobel laureate in science, and one of the most influential physicists in the world.
1. Dr. James Barry (Margaret Ann Bulkley) – first successful C-section recorded in History

Born in Cork and assigned female gender at birth as Margaret Ann Bulkley, James Barry lived and presented as a man to study and practice medicine, which was not accessible to women at the time.
Dr. James Barry became Inspector General of Military Hospitals and the first surgeon to perform one of the first successful cesarean sections recorded in Africa, where the mother and the child survived.
Barry’s talents were also widely known for improving the living conditions of wounded soldiers and indigenous populations.
It was only after Barry died in 1865 that the gender assigned at birth became known.
Here are five of the most influential Irish people who helped shape the world we live in today. Although their discoveries are known to all, you’ve probably never heard of them, which leaves behind them a legacy of quiet revolution!

