The phrase here be dragons feels like the signature of every medieval map, yet the Latin words hic sunt dracones appear on exactly one known historical artifact: the Hunt-Lenox Globe, a hollow copper sphere about five inches across made around 1504 to 1508. This episode unpacks why the famous warning is largely a modern illusion and what cartographers actually drew when they ran out of knowledge.

From the note that lions abound on a 10th-century map to a walrus mistaken for a monster on Martin Waldseemuller’s 1516 Carta Marina, we look at how Roman traditions, Ptolemy’s rediscovered Geographia, and secondhand sailors’ tales shaped the edges of the known world. The conversation also covers dragons as theological symbols, Fra Mauro’s dragons with healing stones, a Japanese earthquake dragon, Jonathan Swift’s 1733 satire of elephants filling blank spaces, and the phrase’s second life as a warning in software.

• Why here are lions was the actual medieval convention, and why hippos, elephants, and cannibal tribes counted as monsters
• How a walrus became the terrifying morsus on Waldseemuller’s map and was simply moved toward Greenland in the 1522 revision
• Dragons on the Psalter map as symbols of sin and the underworld, versus the Borgia map’s dragon presented as factual geography
• Fra Mauro’s contradiction: recording dragons with healing stones drawn from Albertus Magnus while doubting tales of basilisks and giant serpents
• How horror vacui, Swift’s mockery, and the Berlin Conference era pushed mapmakers from decorative animals to honest blank spaces