A.T. Robertson Commentary Mark 6:23

"And he sware unto her, Whatsoever thou shalt ask of me, I will give it thee, unto the half of my kingdom." — Mark 6:23 (ASV)

And he sware unto her (κα ωμοσεν αυτη). The girl was of marriageable age though called κορασιον (cf. Esther 2:9). Salome was afterward married to Philip the Tetrarch. The swaggering oath to the half of the kingdom reminds one of Es 5:3f. , the same oath made to Esther by Ahasuerus.