Therefore Christ, as he is God, has under him, emperors, kings, princes to be his vicegerents; who therefore are called gods (Ps 82:1). But as he is Mediator, i.e., a priest, prophet, and king of the church, he has no vicegerent, vicar, or lieutenant, who, in his either kingly or priestly office, in both, or but one, can be in his stead.

William Perkins, Golden Chaine, ch. 18 in The Works of William Perkins (Grand Rapids: Reformation Heritage Books, 2018) 6.53  (HT: Particular Voices)