Before the age of exploration, a Stoic philosopher mapped the world on a globe.

Ideas & Philosophy · Published 3 October 2026 Swipe more like this →

In short: Long before modern cartography, Crates of Mallus envisioned a spherical Earth divided into distinct climatic zones. By constructing the earliest known terrestrial globe, he theorized that the known world was merely one of four landmasses, separated by vast oceans—a bold hypothesis that anticipated the existence of distant continents.

Crates of Mallus, a prominent Stoic philosopher and grammarian, led the literary school at Pergamum during the 2nd century BC. Under the support of rulers Eumenes II and Attalus II, he headed the city's library and established himself as a leading intellectual of his time. His influence extended to Rome, where an accidental fall into an open sewer during a diplomatic mission in 168 BC or 159 BC forced him to remain in the city. His subsequent lectures there are credited with introducing the Romans to the systematic study of grammar and literary criticism.

Central to his intellectual legacy was his approach to Homeric texts. Unlike his rival Aristarchus of Samothrace, who led the Alexandrian school, Crates championed an allegorical method of interpretation. He argued that Homeric poetry was designed to convey deep philosophical and scientific truths. This belief in the hidden meaning of literature drove his extensive commentaries on the Iliad and Odyssey, as well as his work on Hesiod and various playwrights. He distinguished between the grammarian, who merely applied language rules, and the critic, who investigated the broader context of a work.

Crates is perhaps most famous for his pioneering work in geography. He theorized that the Earth was a sphere divided into five climatic zones. He posited that a massive, impassable torrid zone at the equator was occupied by the Ocean, separating the known world from three other theoretical continents. While he was incorrect about the location of the world's water—which actually circles the globe at the 60th parallel south rather than the equator—his model correctly anticipated the existence of landmasses beyond the known horizon. His conceptual globe, which he suggested should be at least ten feet in diameter to be effective, remains a landmark in the history of scientific thought.

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