Which preposition to use with unacknowledged

by Occurrences 1%

One of these gentlemen only, the chief-engineer, who came to make new roads for Lesdernier, by order of government, had already been a visitor of some weeks, and a strong attachment, vital from the first, had sprung up between us; so far, unacknowledged by either.

in Occurrences 1%

Outside, you may be a husband wonderfully beloved and tragically important; you may be a man whose courage has be-medalled your brave breast; you may be a passionate and subtle musician in your private hours; you may even on Sundays be a much appreciated vessel of the divine: but all such distinctions are not current here; here they are foreign coin, diplomas unacknowledged in this barbarous realm of ink and steel.

to Occurrences 1%

Madeline Lester, at the age of eighteen, was the beauty and toast of the whole country; with a mind no less beautiful than her form was graceful, and a desire for study equalled only by her regard for those who possessed it, a regard which had extended secretly, if all but unacknowledged to herself, to the solitary scholar of whom I have been speaking.

Which preposition to use with  unacknowledged