In the autumn of 1550, an anonymously authored volume containing a wealth of geographical information new to Europeans was published in Venice. This was closely followed by two further volumes that, when taken together, constituted the largest release of geographical data in history, and could well be considered the birth of modern geography. The editor of these volumes was a little-known public servant in the Venetian government, Giovambattista Ramusio. He gathered a vast array of both popular and closely guarded narratives, from the journals of Marco Polo to detailed reports from the Muslim scholar and diplomat Leo Africanus. Andrea di Robilant brings to life the man who used all his political skill, along with the help of conniving diplomats and spies, to democratise knowledge and show how the world was much larger than anyone previously imagined.