Did Medieval People Think the Earth Was Flat?
The myth, its surprisingly modern origin, and what educated people actually believed
No. Educated people in the Middle Ages did not think the Earth was flat — they knew it was a sphere. The spherical Earth had been established by ancient Greek thinkers: Pythagoras and Aristotle argued for it, and around 240 BCE Eratosthenes even estimated its circumference with remarkable accuracy. That knowledge was never lost in medieval Europe. Standard medieval textbooks, from Bede in the 8th century to the widely used On the Sphere of the World by Sacrobosco (c. 1230), taught a round Earth.
The idea that medieval people believed in a flat Earth is a myth largely invented in the 19th century. It was popularized by writers like Washington Irving (in his romanticized 1828 biography of Columbus) and by anti-religious 'conflict thesis' authors such as John William Draper and Andrew Dickson White, who wanted to portray the medieval Church as an enemy of science. Historians of science call this the 'myth of the flat Earth,' and it does not survive contact with the actual sources. Columbus's contemporaries did not fear he would sail off the edge of the world — they correctly argued he had underestimated the Earth's size (and they were right).
Myth vs. record
Myth: everyone in the Middle Ages thought the world was flat, and Columbus bravely proved it was round. Record: the sphericity of the Earth was standard educated knowledge throughout the medieval period. The debate over Columbus was about distance, not shape — his critics correctly judged that Asia was much farther west than Columbus claimed.
The evidence: medieval scholars routinely referred to the Earth as a globe. The image of the orb held by kings and emperors symbolized a spherical world. Dante's Divine Comedy (early 1300s) assumes a spherical Earth. University curricula across Europe taught Sacrobosco's spherical-Earth textbook for centuries.
Where the myth came from: it is essentially a 19th-century construction. Washington Irving dramatized a nonexistent flat-Earth confrontation at Salamanca; Draper (1874) and White (1896) folded it into a broader (and now discredited) narrative of perpetual 'war' between science and religion. Modern historians of science, such as Jeffrey Burton Russell, have documented how recent the myth actually is.
Frequently asked questions
Did people in the Middle Ages think the Earth was flat?
No. Educated medieval Europeans knew the Earth was a sphere, a fact established by the ancient Greeks and taught in standard medieval textbooks. The belief that they thought it was flat is a modern myth.
Didn't Columbus prove the Earth was round?
No. Educated people already knew it was round. The dispute over Columbus's 1492 voyage was about the Earth's size and the distance to Asia — his critics correctly argued he had badly underestimated it. He reached the Americas, which he did not know existed, not the edge of a flat world.
Who first showed the Earth is a sphere?
Ancient Greek thinkers. Pythagoras and Aristotle argued for a spherical Earth, and around 240 BCE Eratosthenes estimated its circumference with impressive accuracy using shadow measurements. This knowledge was preserved through the medieval period.
Where did the flat-Earth myth come from?
Largely the 19th century. Washington Irving's 1828 book on Columbus dramatized a fictional flat-Earth confrontation, and 'conflict thesis' authors John William Draper (1874) and Andrew Dickson White (1896) spread it to depict religion as hostile to science. Historians now call it the 'myth of the flat Earth.'
Explore related events on the timeline
- Aristotle, who argued for a spherical Earth
- Galileo and the birth of observational astronomy
- Columbus and the European arrival in the Americas, 1492
Related guides
Sources consulted
- Jeffrey Burton Russell, Inventing the Flat Earth (Praeger)
- Encyclopaedia Britannica, 'Myth of the flat Earth'
Researched with AI and verified against mainstream scholarship and the cited sources on this page. See our methodology and corrections policy.