I've actually not seen this term, but am rather certain as to what it means.

All cathedrals --as well as abbeys, collegial churches, etc.-- were great landowners. By the end of the Middle Ages the Church, collectively, was by far the largest landowner in France.

The management of this valuable source of revenue --the "domains" of the church-- of course required quite a few officers, usually beginning with the "provosts" (prévo^ts) of the cathedral chapter.

Every cathedral chapter was a bit different in its organization and customs --the setup at Chartres is the one I know best.

Just as, for ecclesiastical administrative purposes, the diocese was divided up into multiple Archdeaconries, it was also divided up into several prévo^tés, each the responsibility of a provost.

There the 5 or 6 (I forget how many there were) provosts were lower ranking "Dignataires" of the chapter --"officiers," if you will-- and each oversaw the land in their own part of the diocese.

Since they were essentially financial officers, and the possibilities for corruption were always present, at Chartres there had to be a major shakeup in the number and size of the prévotés in the mid-1190s, when the building of the new cathedral after the 1194 fire put a special financial strain on the Chapter.

While most chapters had to have had some analogous set up, and in most the major overseers of the management of the land were probably called Provosts, as I say, every chapter was a bit different, and I would hesitate to give the guys in your diocese this title unless I knew that was indeed the case.

If it was, then your officiers domaniaux should be called, in English, Provosts --though you should add some further explanation, like "the Provosts, who oversaw the domains of the cathedral."

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Note added at 57 mins (2014-04-24 17:03:02 GMT)
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Btw, you are, technically, right that "the cathedral had no land attached to it."

But that was because, for the middlevils, it wasn't the institution of the cathedral (or abbey, or whatever) that owned the land, but rather the *saint* to whom the cathedral was dedicated.

At Chartres (dedicated to the Virgin), the term used for the land was "the lands of St. Mary" --at the royal abbey of St. Denis, it was "the lands of St. Denis," etc.