* Greek geographer and explorer who lived in the 4th century BC.
* Explored the Atlantic Ocean and visited Britain, possibly the first non-native to do so.
* Wrote a book about his travels, titled _On the Ocean_, which has been lost.
Hanno the Navigator
* Carthaginian explorer who lived in the 5th century BC.
* Explored the west coast of Africa, reaching as far as Sierra Leone.
* Wrote a book about his travels, titled _Periplus_, which has been preserved.
Julius Caesar
* Roman general and statesman who lived in the 1st century BC.
* Invaded Britain in 55 and 54 BC, the first Roman to do so.
* Wrote a book about his campaigns, titled _Commentarii de Bello Gallico_, which contains a description of Britain.
Agricola
* Roman general and governor of Britain from 78 to 84 AD.
* Expanded the Roman Empire in Britain, reaching as far as Scotland.
* Wrote a biography of his father-in-law, Tacitus, which contains a description of Britain.
Ohthere of Hålogaland
* Norwegian explorer who lived in the 9th century AD.
* Sailed around the Scandinavian Peninsula and into the White Sea.
* Visited England and met with King Alfred the Great.
Wulfstan of Hedeby
* Danish explorer who lived in the 9th century AD.
* Sailed from the Baltic Sea to the Caspian Sea.
* Visited England and met with King Alfred the Great.