Aristobulus of Cassandreia (ca. 375 - 301 BC), Greekhistorian, son of Aristobulus, probably a Phocian settled in
Cassandreia[1][2][3], accompanied Alexander the Great on his campaigns. He served throughout as an architect and engineer and as a close friend of Alexander, enjoying royal confidence, and was entrusted with the repair of the tomb of Cyrus in Pasargadae. He wrote an account, mainly geographical and ethnological. His work was largely used by Arrian. Plutarch also uses him as a reference.
He used the word pothos to interpret the actions, spirit and personality of Alexander.