Which preposition to use with dragomen

of Occurrences 6%

The dragoman of the latter was deputed to procure a sufficient quantity of the drug.

to Occurrences 3%

He was a dragoman to the English Consulate; his master had told him we would be here the next day, and he must be prepared to receive us.

in Occurrences 2%

As she sent for me to be her dragoman in all her disputes on the road, you may conceive how glad I was to arrive at Turin to be rid of her.

at Occurrences 1%

[Footnote 75: Relating to the conduct and character of William B. Hodgson (nominated to be consul at Tunis) while dragoman at Constantinople.]

with Occurrences 1%

If you have been lucky enough to come up here without a guide or dragoman with a bosom full of ivory-handled revolvers and long knives, you will sit for hours spellbound.

Which preposition to use with  dragomen