σύντροφος, sharing his life, i.e., constantly attending on him, habitual to him: cp. Ai. 639“οὐκέτι συντρόφοις” | “ὀργαῖς ἔμπεδος”, the dispositions that have grown with his growth,—the promptings of his own nature. Thuc. 2. 50(the plague) “ἐδήλωσε...ἄλλο τι ὂν ἢ τῶν ξυντρόφων τι” (the familiar maladies). Polyb. 4. 20 (“τὴν μουσικὴν”) “σύντροφον ποιεῖν”. The genit. (φωτὸς), though less usual than the dat., hardly requires us to view “σύντροφος” as a subst. (‘companion’): cp. Phaed. 96D “τὰ αὐτῶν οἰκεῖα”, the things appropriate to them.