Look at a medieval world map and you may find Jerusalem near the centre, east at the top and creatures occupying places that would make a modern atlas editor nervous. It is easy to conclude that its maker simply did not know where things were. Often that misses the map's purpose. A medieval mappa mundi could be a picture of history, belief and knowledge as much as a tool for finding a route.¹
What a map was for
The famous Hereford Mappa Mundi, made around 1300, contains cities, rivers, biblical events, peoples and animals in a densely illustrated world. It is not trying to give you a reliable distance between two inns. It presents a Christian view of the known world and its place in a story stretching from creation towards judgement. Jerusalem's prominence communicates religious meaning.¹
Orientation is a convention, not a law of nature. We are accustomed to north at the top because modern maps frequently put it there. Some medieval Christian maps placed east, associated with Eden, at the top. A person who grows up with north-up maps may feel that any other orientation is “wrong”, even though turning the page cannot alter the Earth.
Scale may also yield to importance. A sacred city or a familiar region can be drawn large because it matters to the map's audience. Unknown lands can be compressed, decorated or left vague. The resulting image can tell us more about what its makers valued than about how they would sail from one harbour to another.
Medieval mapmaking was not one thing
The broad label “medieval map” hides many traditions. Portolan charts made for navigation could record coastlines and sailing directions with striking practical detail. Islamic scholars, travellers and European mapmakers also drew on different geographic knowledge. The Metropolitan Museum notes the variety of medieval mapping, including works whose aims were far from the symbolic world map.²
A map of a city could emphasise walls, churches, roads or political identity according to what its viewer needed.³ Modern maps do this too. A subway diagram distorts distances so connections are easy to see; a weather map colours temperatures rather than buildings; a tourist map enlarges landmarks. None is a failed photograph of Earth.
What the strangeness reveals
Some medieval depictions include travellers' reports that were inaccurate or fantastical. Limited measurement and inherited authorities mattered. We should not romanticise every error as intentional symbolism. But it is equally mistaken to treat every surprising feature as evidence of ignorance. Meaning, available information and technical purpose all shaped the page.
How to read an unfamiliar map
Start with the intended viewer. Was the image displayed in a religious setting, carried by a traveller or made for a ruler? Then look at what receives visual emphasis. A larger building may be a destination, a seat of power or a landmark, not a claim about its physical size. Repeated symbols can mark categories—cities, mountains or marvels—without depicting each place as a measured survey.²
The Hereford map is especially rich because it combines geographic names with scenes and stories. It gives modern viewers a route into medieval learning, yet it should not stand in for all medieval geography. A navigator trying to reach a port needed different information from a cleric considering the world's sacred history. Both could be competent within their tasks.
The modern map is selective too
We tend to trust a printed map because it has coordinates and a familiar outline. But every flat world map distorts a spherical Earth. Choices of projection enlarge some regions and shrink or reshape others. A street map may omit footpaths; a political map may exaggerate borders by drawing them as sharp lines. Contemporary digital maps choose which shops and routes to make visible. Their apparent neutrality is also designed.
This parallel is not an excuse for old geographic errors. It is a way to compare maps fairly. Ask whether a map fulfilled the purpose its maker set for it. A medieval world diagram can fail as a navigational guide and still succeed as a compact picture of a culture's knowledge and values.
When a medieval map looks strange, the strangeness can be informative. It points to assumptions we usually take for granted: north at the top, distance as the principal scale, and geography separated from story. Those assumptions serve us well for many tasks. They are not the only things a map can do.
The most useful question is therefore not “why did they draw the world incorrectly?” It is “what did this map ask its viewer to understand?” Sometimes the answer is a route. Sometimes it is a relationship among places, stories and beliefs. Seen that way, medieval maps stop looking like primitive versions of ours and become evidence of different ways to organise a world.