The interpretation timeline
Daniel 2:44 Douay-Rheims

But in the days of those kingdoms the God of heaven will set up a kingdom that shall never be destroyed, and his kingdom shall not be delivered up to another people, and it shall break in pieces, and shall consume all these kingdoms, and itself shall stand for ever.

A.D. 108 – 1871 6 witnesses

Patristic

before A.D. 750
108
A.D.
c. A.D. 50–107
“He, being begotten by the Father before the beginning of time, was God the Word, the only-begotten Son, and remains the same for ever; for "of His kingdom there shall be no end," says Daniel the prophet. Let us all therefore love one another in harmony, and let no one look upon his neighbour according to the flesh, but in Christ Jesus. Let nothing exist among you which may divide you; but be ye united with your bishop, being through him subject to God in Christ.”
Source
date
unknown
c. A.D. 550
“And in the days of those kings shall the God of Heaven set up a Kingdom which shall never be destroyed, nor shall the sovereignty thereof be left to another people, and it shall stand for ever (Dan. ii, 44). And in the vision he says: And he came even to the Ancient of days and they brought him near before him—and there was given him dominion and glory and a kingdom, that all people, nations and languages should serve him; his dominion is an everlasting dominion, and his kingdom that which shall not be destroyed (Dan. vii, 13, 14). This is one instance more of his saying the same thing both in the image and the vision, namely, that at the coming of the Lord Christ those kingdoms shall pass away and be destroyed, but his kingdom shall be indissoluble and eternal”
Source

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“And in the days of these kings in the days of these kings, when the kingdom of Rome is still in existence. the God Of heaven will set up a kingdom The kingdom of the Holy One, blessed be He, which will never be destroyed, is the kingdom of the Messiah. it will crumble and destroy It will crumble and destroy all these kingdoms.”
Source

Post-Reformation

c. 1650 – 1900
1832
A.D.
Adam Clarke Methodist
1762–1832
“A kingdom which shall never be destroyed - The extensive and extending empire of Christ. Shall not be left to other people - All the preceding empires have swallowed up each other successively; but this shall remain to the end of the world.”
1849
A.D.
1774–1849
“Kingdom of Christ, in the Catholic Church, which cannot be destroyed. (Challoner) — This alone cannot be destroyed. (Worthington) — All other empires change. The Catholic Church has stood for seventeen centuries in the midst of persecutions, which gives us an assurance that she will continue for ever. (Calmet) — “Then,” says Munster, “was the kingdom of Christ set up, not by arms,…but by the divine power.” This interpretation arises from the improper version, without hands; whereas the sequel shews that the empire here spoken of, is attended with the like violence as the four others, which it destroys. The Roman empire was in no degree connected with others by marriage. In the following verse, Munster improperly turns to the second coming of our Saviour. Grotius here asserts that the stone alludes to the Roman armies, prefiguring the Son of man, whose gospel is indicated by the progress of the Roman empire, as both sprung from small beginnings. But who informed him that there were such figures in that empire as in the Old Testament? All empires begin in that manner, and types should have some greater resemblance with the reality. The Church meddles not with the temporal powers. It is therefore plain that the prophet speaks of empires which shall succeed each other. (Houbigant. perf. Prop. 340.) — Kingdoms. That of Rome comprised all the former. The persecuting emperors are forced to yield, and the colossal power of infidelity and vice falls before the gospel. Christ’s dominion is spiritual, exercised against wickedness; (Calmet) is heavenly and eternal. (Haydock) — The blood of martyrs was more efficacious in the establishing of Christianity, than fire and sword had been in forming other empires. (Menochius)”
Source
1871
A.D.
1871
“in the days of these kings--in the days of these kingdoms, that is, of the last of the four. So Christianity was set up when Rome had become mistress of Judea and the world (Luk 2:1, &c.) [NEWTON]. Rather, "in the days of these kings," answers to "upon his feet" (Dan 2:34); that is, the ten toes (Dan 2:42), or ten kings, the final state of the Roman empire. For "these kings" cannot mean the four successional monarchies, as they do not coexist as the holders of power; if the fourth had been meant, the singular, not the plural, would be used. The falling of the stone on the image must mean, destroying judgment on the fourth Gentile power, not gradual evangelization of it by grace; and the destroying judgment cannot be dealt by Christians, for they are taught to submit to the powers that be, so that it must be dealt by Christ Himself at His coming again. We live under the divisions of the Roman empire which began fourteen hundred years ago, and which at the time of His coming shall be definitely ten. All that had failed in the hand of man shall then pass away, and that which is kept in His own hand shall be introduced. Thus the second chapter is the alphabet of the subsequent prophetic statements in Daniel [TREGELLES]. God of heaven . . . kingdom--hence the phrase, "the kingdom of heaven" (Mat 3:2). not . . . left to other people--as the Chaldees had been forced to leave their kingdom to the Medo-Persians, and these to the Greeks, and these to the Romans (Mic 4:7; Luk 1:32-33). break . . . all-- (Isa 60:12; Co1 15:24).”
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.