Sea farer from
Massalia (today's Marseille) who lived in the 4th century BC.
Pytheas described a journey along the Atlantic coast of Europe up to the south coast of Brittany and the island Thule in the north. Thule was supposedly Scandinavia, and he described its people, its summer solstice and the frozen sea, as well as what he had heard about Ireland.
According to Pytheas, the world is an island surrounded by a huge ocean. Even in antiquity he was much criticism and accused of being a liar.