Australia was first known as "terra australis incognita" or unknown southern land in Roman times. The first undisputed European sighting was by Dutch explorer Willem Janszoon in 1606. In 1642, Dutch explorer Abel Tasman discovered Tasmania, naming it Van Diemen's Land. The first Englishman to see Australia was William Dampier in 1688. In 1770, Captain James Cook mapped the east coast of Australia for Britain and named the region New South Wales.