Johannes van Keulen

Johannes van Keulen was born in 1654 in the Dutch Republic. He was baptised on 8 January 1654 in Amsterdam.

In 1678, van Keulen established himself in Amsterdam as a publisher of nautical charts and pilot guides.

In 1680, he obtained a patent from the States of Holland and West Friesland granting him the exclusive right to print and publish maritime atlases and navigation manuals. These works combined sea charts with written sailing directions used by helmsmen. The patent protected his publications from unauthorized copying, an important safeguard in a trade where the production of engraved charts required significant investment.

Van Keulen operated under the name In de Gekroonde Lootsman ("In the Crowned Pilot"), the imprint of his publishing house. He entered into collaboration with Claes Jansz Vooght, an Amsterdam cartographer and mathematician who played a key role in the preparation of charts for the firm’s publications.

He also acquired the stock of Hendrik Doncker, an Amsterdam publisher of nautical charts, which provided access to existing materials and strengthened his position within the Dutch maritime publishing trade.

Van Keulen built a firm that became one of the leading producers of navigational works in the Dutch Republic, supplying charts and sailing directions used by mariners across European and overseas routes.