Mark 6:21

εὐκαίρου, a day convenient for the long cherished purpose of Herodias; so regarded by her as well as by the evangelist. She had a chance then, if ever, and might hope that by wine, love, and the assistance of obsequious guests, her irresolute husband would at last be brought to the point (Grotius). The word occurs again in the N. T., Hebrews 4:16, εὔκαιρον βοήθειαν = seasonable succour. μεγιστᾶσιν (μεγιστᾶνες from μέγιστος), magnates. A word belonging to Macedonian Greek, condemned by Phryn. (p. 196: μέγα δυναμένοι the right expression), frequent in Sept [52] With these magnates, the civil authorities, are named the chief military men (χιλιάρχοις) and the socially important persons of Galilee (πρώτοις) an imposing gathering on Herod's birthday.

[52]Septuagint.