Before revision: History While there are multiple mentions of "natural body cycle" in Eastern and Native American culturescitation needed, the earliest recorded Western account of a circadian process is credited to Theophrastus, dating from the 4th century BC, probably provided to him by report of Androsthenes, a ship's captain serving under Alexander the Great.
After revision: History The earliest recorded account of a circadian process is credited to Theophrastus, dating from the 4th century BC, probably provided to him by report of Androsthenes, a ship's captain serving under Alexander the Great.