This generally commences from the house where the bridegroom lives, whose mother is the negotiatrix for him, and begins her duties by taking a good leg of venison or bear's meat, or something else of the same kind, to the house where the bride dwells, not forgetting to mention that her son has killed it.    From Wordnik.com.  [Traditions of the North American Indians, Vol. 1 (of 3)] Reference

This close and tender union of the three continued through all separations and all trials; the confidence of the captive king was responsive to the devotion of his mother the regent and of his sister who had become his negotiatrix.    From Wordnik.com.  [A Popular History of France from the Earliest Times, Volume 4] Reference

Considering the negotiation to be now in effect brought within view of a happy termination, her ambassador, furnished with her ultimatum, having now actually set out on his ostensible mission of duck-shooting, our fair negotiatrix prepared to show the usual degree of gratitude towards those who had been the principal instruments of her success.    From Wordnik.com.  [Tales and Novels — Volume 05] Reference