The interpretation timeline
Revelation 5:5 Douay-Rheims

And one of the ancients said to me: Weep not; behold the lion of the tribe of Juda, the root of David, hath prevailed to open the book, and to loose the seven seals thereof.

A.D. 235 – 1871 10 witnesses 11 excerpts

Patristic

before A.D. 750
235
A.D.
Hippolytus of Rome Patristic
c. A.D. 170–235
“Now, as our Lord Jesus Christ, who is also God, was prophesied of under the figure of a lion, on account of His royalty and glory, in the same way have the Scriptures also aforetime spoken of Antichrist as a lion, on account of his tyranny and violence. For the deceiver seeks to liken himself in all things to the Son of God. Christ is a lion, so Antichrist is also a lion; Christ is a king, so Antichrist is also a king. The Saviour was manifested as a lamb; so he too, in like manner, will appear as a lamb, though within he is a wolf. The Saviour came into the World in the circumcision, and he will come in the same manner. The Lord sent apostles among all the nations, and he in like manner will send false apostles. The Saviour gathered together the sheep that were scattered abroad, and he in like manner will bring together a people that is scattered abroad. The Lord gave a seal to those who believed on Him, and he will give one like manner. The Saviour appeared in the form of man, and he too will come in the form of a man. The Saviour raised up and showed His holy flesh like a temple, and he will raise a temple of stone in Jerusalem.”
Source
303
A.D.
c. A.D. 250–303
“"Lo, the Lion of the tribe of Judah, the root of David, hath prevailed." We read in Genesis that this lion of the tribe of Judah hath conquered, when the patriarch Jacob says, "Judah, thy brethren shall praise thee; thou hast lain down and slept, and hast risen up again as a lion, and as a lion's whelp." For He is called a lion for the overcoming of death; but for the suffering for men He was led as a lamb to the slaughter. But because He overcame death, and anticipated the duty of the executioner, He was called as it were slain. He therefore opens and seals again the testament, which He Himself had sealed. The legislator Moses intimating this, that it behoved Him to be sealed and concealed, even to the advent of His passion, veiled his face, and so spoke to the people; showing that the words of his announcement were veiled even to the advent of His time. For he himself, when he had read to the people, having taken the wool purpled with the blood of the calf, with water sprinkled the whole people, saying, "This is the blood of His testament who hath purified you." It should therefore be observed that the Man is accurately announced, and that all things combine into one. For it is not sufficient that that law is spoken of, but it is named as a testament. For no law is called a testament, nor is any thing else called a testament, save what persons make who are about to die. And whatever is within the testament is sealed, even to the day of the testator's death. Therefore it is with reason that it is only sealed by the Lamb slain, who, as it were a lion, has broken death in pieces, and has fulfilled what had been foretold; and has delivered man, that is, the flesh, from death, and has received as a possession the substance of the dying person, that is, of the human members; that as by one body all men had fallen under the obligation of its death, also by one body all believers should be born again unto life, and rise again. Reasonably, therefore, His face is opened and unveiled to Moses; and therefore He is called Apocalypse, Revelation. For now His book is unsealed-now the offered victims are perceived-now the fabrication of the priestly chrism; moreover the testimonies are openly understood.”
Source
411
A.D.
Tyrannius Rufinus Patristic
c. A.D. 345–411
“behold the lion. the death of Christ marked the defeat and the triumph over the demons. In fact, our Lion had captured all the prey that the hostile lion had conquered after destroying and crushing the man. Then, by coming back from the underworld and ascending on high, he made slavery his captive. Therefore in his sleep the Lion won and defeated every evil and destroyed the one who had the power of death. (Blessing of the Patriarchs 1.6)”
Source
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“So the true victory of our Lord Jesus Christ was achieved when he rose again and ascended into heaven. Then was fulfilled what you heard when the Apocalypse was read, "The lion from the tribe of Judah has conquered." It is he that is called a lion, he that is called a lamb. He is called a lion for courage, a lamb for innocence. A lion because unconquered, a lamb because gentle. And when this lamb was slain, he conquered by his death the lion "who prowls around seeking whom he may devour." The devil, you see, is called a lion for his ferocity, not for any virtue. Thus the apostle Peter says we must be on the watch against temptations, "because your adversary the devil is prowling around seeking whom he may devour"; but he did say how he prowls around: "Like a roaring lion he is prowling around, seeking whom he may devour." Who could avoid encountering the teeth of this lion, if the lion from the tribe of Judah had not conquered? Against the lion fights a lion, against the world a lamb. The devil was exultant when Christ died, and by that very death of Christ was the devil conquered. It's as though he took the bait in a mousetrap. He was delighted at the death, as being the commander of death. What he delighted in, that's where the trap was set for him. The mousetrap for the devil was the cross of the Lord. The bait he would be caught by, the death of the Lord. And our Lord Jesus Christ rose again.”
Source
“"Like a sheep he was led to be slaughtered, and like a lamb in the presence of his shearer he was without voice, thus he did not open his mouth Who is this?." Obviously the one about whom he goes on to say, "In humility his judgment was taken away. His generation, who shall relate?" I can see this model of such humility in a king of such power and authority. Because this one, who is like a lamb not opening its mouth in the presence of the shearer, is himself "the lion from the tribe of Judah." Who is this, both lamb and lion? He endured death as a lamb; he devoured it as a lion. Who is this, both lamb and lion? Gentle and strong, lovable and terrifying, innocent and mighty, silent when he was being judged, roaring when he comes to judge. Or perhaps both in his passion lamb and lion, and also in his resurrection lamb and lion. Let us see him as a lamb in his passion. It was stated a moment ago: "Like a lamb in the presence of his shearer he was without voice, thus he did not open his mouth." Let us see him as a lion in his passion; Jacob said, "You have gone up, lying down you have slept like a lion." Let us see him as a lamb in his resurrection. The book of Revelation, when it was talking about the eternal glory of virgins, "They follow the lamb, it is said, wherever he goes." The same book of Revelation says, what I mentioned just now, "The lion from the tribe of Judah has conquered, to open the book." Why a lamb in his passion? Because he underwent death without being guilty of any iniquity. Why a lion in his passion? Because in being slain he slew death. Why a lamb in his resurrection? Because his innocence is everlasting. Why a lion in his resurrection? Because everlasting also is his might.”
Source
604
A.D.
Gregory the Great Patristic
c. A.D. 540–604
“Forasmuch as the nature of every thing is compounded of different elements, in Holy Writ different things are allowably represented by any one thing. For the lion has magnanimity, it has also ferocity: by its magnanimity then it represents the Lord, by its ferocity the devil. Hence it is declared of the Lord, Behold, the Lion of the tribe of Judah, the Root of David hath prevailed. Hence it is written of the devil, Your adversary, the devil, like a roaring lion, walketh about seeking whom he may devour.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And one of the elders said unto me,.... The Ethiopic version reads, "one of these elders"; that is, one of the four and twenty elders that were round about the throne; not the first of the four and twenty books of the Old Testament; nor the patriarch Jacob, because of the prophecy concerning Shiloh, Judah's son, which stands in Gen 49:10, nor Moses, who spoke of the Messiah as the great prophet of the church; nor John the Baptist, who pointed out the Lamb of God; these are all fancies and conjectures. It was one of the members of the Christian church, who was near the throne of God, had communion with him, and knowledge of his will, who in this visionary way is represented as comforting John under his sorrow and concern, and giving him information: and sometimes persons of superior abilities may receive instruction from meaner persons, as did Apollos from Aquila and Priscilla: the same said unto John, weep not; cease sorrowing, do not be cast down, nor despair; behold the lion of the tribe of Judah; by whom is meant Christ, who, according to the flesh, was to come of the tribe of Judah; and certain it is, that our Lord sprang from thence: and he is said to be the lion of that tribe, in allusion to the prophecy concerning Judah in Gen 49:9, where he is said to be a lion, an old lion stooping down and couching, and on whose standard was the figure of a lion. Christ may be compared to one, because of his great strength, he being the mighty God, the able Saviour, and strong Redeemer, and protector of his church and people, and the avenger of their enemies; and because of his courage and intrepidity when he engaged with Satan, and his principalities and powers, when he bore the sins of his people, sustained his Father's wrath, and the terrors of death set themselves in array against him; and because of the fierceness of his wrath, and fury against the wicked, and for his generosity and lenity towards those that stoop unto him, and obey him. So the Jews say (f), that "of Messiah, the son of David, who comes forth from Judah, is it said, Gen 49:9, "Judah is a lion's whelp";'' and a little after, Messiah, the son of David, who is "a lion", shall be on his right hand, and Messiah, the son of Joseph, who is an ox, on his left hand; so the word of the Lord frequently, in the Chaldee paraphrase, is said to be a lion (g). The root of David; in like manner is Christ called the root of Jesse in Isa 11:10; and the meaning either is, that he is a branch that springs out of the roots of Jesse and David, is David's son and offspring, according to his human nature; see Rev 22:16; or that he is David's Lord, according to his divine nature: and the metaphor of a root well agrees with him as Mediator, he being hidden out of sight, and unknown to a natural man; and may denote his meanness in his state of humiliation, when he was as a root out of a dry ground; and because he is the root from whence all the elect of God spring, in whom they have their being, and by whom they are bore and supported, and from whom are derived to them all the blessings of grace, all their spiritual life, holiness, fruitfulness, and perseverance. Now this illustrious Person, so described, hath prevailed; or overcome all difficulties, being one of worth and value, of great authority and ability: to open the book, and to loose the seven seals thereof; and deliver out all the prophecies in it, and fulfil them; and this through the merits of his blood, and in consequence of his sufferings and death: hence, in the next verse, he is represented as a lamb as it had been slain; and the four living creatures, and the four and twenty elders, put his worthiness to take the book, and open it, upon his having been slain, and having redeemed them by his blood, Rev 5:9. And as he, upon his resurrection from the dead, had all power in heaven and in earth given him, as Mediator, for the protection of his church, so he was deserving; and it was fit and necessary that he, as the great prophet of the church, should have and deliver out the prophecies concerning the state and condition of his redeemed ones in all ages. (f) Raya Mehimna in Zohar in Exod. fol. 49. 3, 4. (g) Targum in Hos. v. 14. & xi. 10. & xiii. 7.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“The Lion of the tribe of Juda - Jesus Christ, who sprang from this tribe, as his genealogy proves; see on Mat 1:2 (note), Mat 1:3 (note) and Luk 3:23 (note). There is an allusion here to Gen 49:9, Judah is a lion's whelp; the lion was the emblem of this tribe, and was supposed to have been embroidered on its ensigns. The Root of David - See Isa 11:1. Christ was the root of David as to his Divine nature; he was a branch out of the stem of Jesse as to his human nature. Hath prevailed - By the merit of his incarnation, passion, and death. To open the book - To explain and execute all the purposes and decrees of God, in relation to the government of the world and the Church.”
Source
1849
A.D.
1774–1849
“. Behold the lion, of the tribe of Juda, &c. viz. Jesus Christ, who was descended from that tribe, denominated a lion on account of his great power, by which title we find him designated also in the prophecy of Jacob. (Genesis xlix. 9.) (Calmet) — It is he who has merited by his triple victory over death, sin, and hell, the great honour of opening the book, and revealing the secrets therein contained.”
Source
1871
A.D.
1871
“one of--Greek, "one from among." The "elder" meant is, according to some (in LYRA), Matthew. With this accords the description here given of Christ, "the Lion, which is (so the Greek) of the tribe of Juda, the root of David"; the royal, David-descended, lion-aspect of Christ being that prominent in Matthew, whence the lion among the fourfold cherubim is commonly assigned to him. GERHARD in BENGEL thought Jacob to be meant, being, doubtless, one of those who rose with Christ and ascended to heaven (Mat 27:52-53). The elders in heaven round God's throne know better than John, still in the flesh, the far-reaching power of Christ. Root of David-- (Isa 11:1, Isa 11:10). Not merely "a sucker come up from David's ancient root" (as ALFORD limits it), but also including the idea of His being Himself the root and origin of David: compare these two truths brought together, Mat 22:42-45. Hence He is called not merely Son of David, but also David. He is at once "the branch" of David, and "the root" of David, David's Son and David's Lord, the Lamb slain and therefore the Lion of Juda: about to reign over Israel, and thence over the whole earth. prevailed--Greek, "conquered": absolutely, as elsewhere (Rev 3:21): gained the victory: His past victory over all the powers of darkness entitles Him now to open the book. to open--that is, so as to open. One oldest manuscript, B, reads, "He that openeth," that is, whose office it is to open, but the weight of oldest authorities is with English Version reading, namely, A, Vulgate, Coptic, and ORIGEN.”
Source

Undated

date unknown
date
unknown
Glossa Ordinaria Medieval
“And one of the ancients. Every prophet, by announcing the coming of Christ, consoles others. The lion hath prevailed. The lion, when he is put to flight, flees through the mountains, and with the knot which he has in his tail blots out his footprints, lest he be found: so Christ fled through the mountains, that is, his divinity lay hid from the Jews; having assumed flesh he covered his divinity, that it might not be recognised. The lion sleeps with open eyes; so Christ expired while his divinity lived.”
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.