και 2532 CONJ γενομενης 1096 5637 V-2ADP-GSF ημερας 2250 N-GSF ευκαιρου 2121 A-GSF οτε 3753 ADV ηρωδης 2264 N-NSM τοις 3588 T-DPN γενεσιοις 1077 N-DPN αυτου 846 P-GSM δειπνον 1173 N-ASN εποιει 4160 5707 V-IAI-3S τοις 3588 T-DPM μεγιστασιν 3175 N-DPM αυτου 846 P-GSM και 2532 CONJ τοις 3588 T-DPM χιλιαρχοις 5506 N-DPM και 2532 CONJ τοις 3588 T-DPM πρωτοις 4413 A-DPM της 3588 T-GSF γαλιλαιας 1056 N-GSF
Vincent's NT Word Studies
21. Convenient (eukairon). Mark only. Convenient for Herodias' purpose. " Opportune for the insidious woman, who hoped, through wine, lust, and the concurrence of sycophants, to be able easily to overcome the wavering mind of her husband " (Grotius in Meyer).Birthday. See on Matt. xiv. 6. The notice of the banquet and of the rank of the guests is peculiar to Mark.
Lords (megistasin). Only here, and Apoc. vi. 15; xviii. 3. A late word, from megav, great.
High captains (ciliarcoiv). Lit., commanders of a thousand men. Answering to a Roman military tribune. Both civil and military dignitaries were present, with other distinguished men of the district (chief men).
Robertson's NT Word Studies
6:21 {When a convenient day was come} (genomenes hemeras eukairou). Genitive absolute. A day well appointed eu, well, kairos, time) for the purpose, the day for which she had long waited. She had her plans all laid to spring a trap for her husband Herod Antipas and to make him do her will with the Baptist. Herod was not to know that he was the mere catspaw of Herodias till it was all over. See on Mt 14:6 for discussion of Herod's birthday (genesiois, locative case or associative instrumental of time). {Made a supper} (deipnon epoiesen). Banquet. {To his lords} (tois megistasin autou). From megistan (that from megas, great), common in the LXX and later Greek. Cf. #Re 6:15; 18:23. In the papyri. The grandees, magnates, nobles, the chief men of civil life. {The high captains} (tois ciliarcois). Military tribunes, commanders of a thousand men. {The chief men of Galilee} (tois prwtois tes galilaias). The first men of social importance and prominence. A notable gathering that included these three groups at the banquet on Herod's birthday.