Which preposition to use with whisperer

of Occurrences 2%

The birth of the dauphin had been a fatal blow to the hopes which had been founded on the possible succession of the king's brothers; and from this time forth the whisperers of detraction and calumny were more than ever busy, sometimes venturing to forge her handwriting, and sometimes daring, with still fouler audacity, to invent stories designed to tarnish her reputation by throwing doubts on her conjugal fidelity.

in Occurrences 1%

It is the unfortunate situation of arbitrary kings, that they know the sentiments of their people only from whisperers in their closet.

Which preposition to use with  whisperer