The interpretation timeline
Mark 13:26 Douay-Rheims

And then shall they see the Son of man coming in the clouds, with great power and glory.

A.D. 430 – 1771 4 witnesses

Patristic

before A.D. 750
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“(de Trin. i. 13) For the vision of the Son of Man is shewn even to the bad, but the vision of the form of God to the pure in heart alone, for they shall see God. (Matt. 5:8) And because the wicked cannot see the Son of God, as He is in the form of God, equal to the Father, and at the same time both just and wicked are to see Him as Judge of the quick and dead, before Whom they shall be judged, it was necessary that the Son of Man should receive power to judge. Concerning the execution of which power, there is immediately added, And then shall he send his angels.”
Source

Scholastic

c. 1100 – 1500
1107
A.D.
c. 1055–1107
“But they shall see the Lord as the Son of Man, that is, in the body, for that which is seen is body.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Now learn a parable of the fig tree,.... Our Lord was now upon the Mount of Olives, in one part of which fig trees grew in great plenty, and one, or more, might be near, and in view; and it was the time of year, the passover being at hand, for its putting forth: when her branch is yet tender; and soft and opening, through the sap now in motion: and putteth forth leaves; from the branches: ye know, that summer is near; from such an appearance on the fig tree; See Gill on Mat 24:32.”
Source

Undated

date unknown
date
unknown
“Or else, the sun shall be darkened, at the coldness of their hearts, as in the winter time. And the moon shall not give her light with serenity, in this time of quarrel, and the stars of heaven shall fail in their light, when the seed of Abraham shall all but disappear, for to it they are likened. (Gen. 22:17) And the powers of heaven shall be stirred up to the wrath of vengeance, when they shall be sent by the Son of Man at His coming, of whose Advent it is said, And then shall they see the Son of Man coming in the clouds with great power and glory, He, that is, who first came down like rain into the fleece of Gideon in all lowliness.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.