Agatharchides, or Agatharchus, of Cnidus, Greek historian and geographer, lived in the time of Ptolemy Philometor (181-146 BC) and his successors.

Amongst other works, he wrote treatises on Asia, Europe and The Red Sea. Interesting extracts from the last, of some length, are preserved in Photius (cod. 213), who praises the style of the author, which was modelled on that of Thucydides.

This entry was originally from the 1911 Encyclopedia Britannica.