Answer
Xenon and Theodotus were both contemporaries of Antiochus III the Great, who ruled the Seleucid Empire from 223 to 187 BC. Xenon was a Greek historian who wrote a history of the Seleucid Empire, while Theodotus was a Greek philosopher who wrote a treatise on ethics. Both men were active during the reign of Antiochus III, and their work reflects the political and intellectual climate of the time.