The map itself is undated, but there are clues it was created in 1491: It quotes a book published that year, and Christopher Columbus may have consulted the map (or a copy) before his great voyage.

In 1492, Christopher Columbus set sail on one of the most consequential expeditions in history. He and his crew spent more ...

Christopher Columbus ... the northern Atlantic coast. Columbus may not have discovered the Americas, but it was his arrival—and subsquent three additional voyages over the next twelve years ...

A newly analyzed medieval manuscript suggests that sailors from the same region as Christopher Columbus may have known about North America more than a century before his 1492 voyage. The revelation ...