Hanmer properly read Or for 'On.'
"Strike all that look upon you with marvel. Come."
"This is your son-in-law,
And son unto the king, who, heavens directing,
Is troth-plight to your daughter."
So it should be punctuated. The folio reads 'whom,' confounding, as usual, who and whom; of which there are other instances in this play. See Introd. p. [59].