Here he quickly acquired a high reputation for administrative ability, as well as for the qualities of sound judgment, moderation, and good sense by which he was subsequently distinguished in the episcopal office.

In the controversies which followed, the disestablishment of the Irish church, particularly in regard to the revision of the prayer book, Gregg took the conservative side, but his influence was uniformly exerted in a conciliatory spirit.

[3] Gregg, at forty-one years of age, thus became a member of the episcopal bench while his father was still Bishop of Cork, Cloyne and Ross.

As Bishop of Cork, Gregg's most noticeable work lay in the completion of the beautiful cathedral of St. Finn Barre, which had been rebuilt during his father's episcopate at a cost of over £100,000; but he also won a deserved reputation not only for administrative efficiency, but for a statesmanlike grasp of church problems which opened the way to the highest office in the Irish church.

He died suddenly at the Palace, Armagh, on 10 January 1896, after scarcely two years' enjoyment of the primacy, and was buried at Frankfield beside his wife Elinor.