βουλευτήριος
From LSJ
Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη. Τὸ δὲ ἡττᾶσθαι αὐτὸν ὑφ' ἑαυτοῦ πάντων αἴσχιστόν τε ἅμα καὶ κάκιστον. → Τo conquer yourself is the first and best victory of all, while to be conquered by yourself is of all the most shameful as well as evil
English (LSJ)
ον,
A giving advice, κακῶν τ' Ἀδράστῳ τῶνδε βουλευτήριον A.Th.575.
German (Pape)
[Seite 457] ον, berathend, ὁ, der Rathgeber, Aesch. Spt. 557.