Second Council of Nicaea, Canon XI

That Œconomi ought to be in the Episcopal palaces and in the Monasteries.

Since we are under obligation to guard all the divine canons, we ought by all means to maintain in its integrity that one which says œconomi are to be in each church.  If the metropolitan appoints in his Church an œconomus, he does well; but if he does not, it is permitted to the Bishop of Constantinople by his own (ἰδίας) authority to choose an œconomus for the Church of the Metropolitan.  A like authority belongs to the metropolitans, if the Bishops who are subject to them do not wish to appoint œconomi in their churches.  The same rule is also to be observed with respect to monasteries.

Translation: Henry R. Percival, The Seven Ecumenical Councils, NPNF II.14 (1900), via CCEL.