 Shortly after whaling began (1611), the Danish—Norwegian crown in 1616 claimed ownership of Jan Mayen and the Spitsbergen islands, as all of Svalbard was then known, but in 1613, the English Muscovy Company had done the same.The primary and most profitable whaling grounds of this joint-stock company came to be centered on Spitsbergen in the early 17th century, and the company's 1613 Royal Charter from the English Crown granted a monopoly on whaling in Spitsbergen, based on the (erroneous) claim that Hugh Willoughby had discovered the land in 1553.Not only had they wrongly assumed a 1553 English voyage had reached the area, but on 27 June 1607, during his first voyage in search of a "northeast passage" on behalf of the company, Henry Hudson sighted "Newland" (i.e.