Agatharchides' On the Erythraean Sea

Agatharchides served as a tutor and secretary in the Ptolemaic court at Alexandria during the 2nd century BC, with access to reports from explorers, merchants, and military expeditions along the Red Sea coast and beyond. His treatise On the Erythraean Sea (Peri tēs Erythras Thalassēs) was among the most detailed geographical works of antiquity. Book I covered the western coast (modern Egypt and Sudan), including a harrowing account of gold mining in the Eastern Desert that described enslaved workers in conditions of extreme brutality — one of the most vivid ancient accounts of forced labour. Books II and III described the eastern coast of Africa (modern Eritrea, Djibouti, Somalia) and its wildlife, including elephants, rhinoceroses, and the first known descriptions of giraffes in Western literature. Books IV and V covered Arabia, including the incense trade, the Nabataeans, and the pearl fisheries of the Persian Gulf. Diodorus Siculus incorporated large sections nearly verbatim into his own Library of History, and the Byzantine patriarch Photius produced a detailed summary in the 9th century. Through these intermediaries, we can reconstruct the work's scope and many specific passages, but the original's full ethnographic detail, literary quality, and scientific observations are irrecoverable.