4th-century BC geographers

Pytheas of Massalia (; Ancient Greek: Πυθέας ὁ Μασσαλιώτης Pythéās ho Massaliōtēs; Latin: Pytheas Massiliensis; born 350 BC, 320–306 BC) was a Greek geographer, explorer and astronomer from the Greek colony of Massalia (modern-day Marseille, France). He made a voyage of exploration to Northern Europe in about 325 BC, but his account of it, known widely in antiquity, has not survived and is now known only through the writings of others.

Megasthenes ( ; , died 290 BCE) was an ancient Greek historian, indologist, diplomat, ethnographer and explorer in the Hellenistic period. He described India in his book Indica, which is now lost, but has been partially reconstructed from literary fragments found in later authors that quoted his work. Megasthenes was the first person from the Western world to leave a written description of India.

ancient Greek mathematician

right|thumb|200px|Dicaearchus of Messana Dicaearchus of Messana (; Dikaiarkhos; ), also written Dikaiarchos (), was a Greek philosopher, geographer and author. Dicaearchus was a student of Aristotle in the Lyceum. Very little of his work remains extant. He wrote on geography and the history of Greece, of which his most important work was his Life of Greece. Although modern scholars often consider him a pioneer in the field of cartography, this is based on a misinterpretation of a reference in Cicero to Dicaearchus's tabulae, which does not refer to any maps made by Dicaearchus but is a pun on

Greek historian (c. 375 BC – 301 BC)

admiral of Alexander the Great