ξένῳ παρ᾽ ἀνδρὶ: Ceÿx, king of Trachis, who is not named in this play. Scut. 353 (Heracles speaks) “Τρηχῖνα δέ τοι παρελαύνω” | “ἐς Κήϋκα ἄνακτα: ὁ γὰρ δυνάμει τε καὶ αἰδοῖ” | “Τρηχῖνος προβέβηκε”. The Hesiodic “Κήϋκος γάμος” described a marriage-feast given by that king, at which Heracles was a guest. Apollodorus (2. 7 § 7) and Diodorus (4. 36 § 57) mention Ceÿx.
ὅπου, not “ὅποι”, since “βέβηκεν” implies, ‘is now’: cp. O. C.52.