Oecumenius

It is the breaking of the fourth seal and the beginning of the release from the sin of Adam's transgression. For this release is the indicator of reconciliation with God. For if "our sins separate us from God", as Isaiah says (Isa. 59:2), then their removal brings us back into fellowship. But what is the remedy? The wounds of Christ, through which we have been freed (see 1 Peter 2:24; Isa. 53:5). For since we were condemned by the pleasure of tasting, we have been healed by its opposites. …

Commentary on Revelation ↗

Alcuin of York

And when he had opened the fourth seal, I heard the voice of the fourth living creature, saying: Come, and see. And behold a pale horse, and he that sat upon him, his name was Death, and hell followed him. The people represented by the pale horse are the same as those represented by the red horse, their spiritual death being now symbolized by the pallor of the horse. …

Commentary On Revelation ↗

Victorinus of Pettau

"And when He had opened the fourth seal, I heard the fourth living creature saying, Come and see. And, lo, a pale horse; and he who sate upon him was named Death." For the pale horse and he who sate upon him bore the name of Death. These same things also the Lord had promised among the rest of the coming destructions-great pestilences and deaths; since, moreover, he says:- "And hell followed him." That is, it was waiting for the devouring of many unrighteous souls. This is the pale horse.

Commentary on the Apocalypse of the Blessed John ↗