Jan Huygen van Linschoten was a Dutch merchant, trader and historian.
He travelled extensively along the East Indies regions under Portuguese influence and served as the archbishop's secretary in Goa between 1583 and 1588. He is credited with publishing in Europe important classified information about Asian trade and navigation that was hidden by the Portuguese. In 1596, he published a book, Itinerario, which graphically displayed for the first time in Europe detailed maps of voyages to the East Indies, particularly India.
During his stay in Goa, he meticulously copied the secret charts page by page. Even more crucially, he provided nautical data like currents, deeps, islands and sandbanks that were absolutely vital for safe navigation, along with coastal depictions to guide the way. The publication of the navigational routes enabled the passage to the East Indies to be opened to trading by the Dutch, French and the English. As a consequence, the Dutch East India Company and the British East India Company would break the 16th-century monopoly enjoyed by the Portuguese on trade with the East Indies.