Sourenas — σουρήνας, the general of the Parthians, who defeated Crassus in BC 54
Ancient Greek word, found 17 times in the texts on Socratos.
Plutarch, Crassus 21.4: καίτοι μάχεσθαι μέλλοντας, ἔφη, σπεύδειν ἔδει, πρὶν ἅπασαν ἐν ταὐτῷ γενέσθαι τὴν δύναμιν ἀναθαρσήσαντος βασιλέως· ἐπεὶ νῦν γε Σουρήνας ὑμῖν προβέβληται καὶ Σιλλάκης ἐφʼ αὑτοὺς ἀναδεξάμενοι τὴν δίωξιν, ὁ δʼ οὐδαμῇ φανερός ἐστιν.