Which preposition to use with chieftainess

in Occurrences 1%

" The other was a woman, who being taken captive, found means to kill her captor, and make her escape, and the tribe were so struck with admiration at the courage and calmness she displayed on the occasion, as to make her chieftainess in her own right.

of Occurrences 1%

This, and his speeches to Manenko, the chieftainess of the district and niece of Shinte, the head chief of the Balonda, gained them a welcome.

Which preposition to use with  chieftainess