 As with the previous claim made by Edge, there is no cartographical or written proof for this supposed discovery.The first verified discoveries of Jan Mayen, by three separate expeditions, occurred in the summer of 1614, probably within one month of each other.The Dutchman Fopp Gerritsz, whilst in command of a whaling expedition sent out by the Englishman John Clarke, of Dunkirk, claimed (in 1631) to have discovered the island on June 28 and named it "Isabella".