ST Suppl., q. 26
Of Those Who Can Grant Indulgences
Supplement — compiled posthumously from Aquinas's early Sentences commentary
We must now consider those who can grant indulgences: under which head there are four points of inquiry:
(1) Whether every parish priest can grant indulgences?
(2) Whether a deacon or another, who is not a priest, can grant indulgences?
(3) Whether a bishop can grant them?
(4) Whether they can be granted by one who is in mortal sin?