Which preposition to use with unwitting

of Occurrences 5%

dost thou then, who only a few hours ago wert my willing vassal, now wish to break away from my gentle rule, because, forsooth, of the words of an old woman, who is no longer vassal of mine, as if, like her, thou art now unwitting of what delights I am the source?

of Occurrences 1%

Unwitting of what had passed between them, it is the teacher from whom comes the suggestion.

Which preposition to use with  unwitting