The interpretation timeline
Revelation 4:7 Douay-Rheims

And the first living creature was like a lion: and the second living creature like a calf: and the third living creature, having the face, as it were, of a man: and the fourth living creature was like an eagle flying.

A.D. 202 – 1871 9 witnesses 10 excerpts

Patristic

before A.D. 750
202
A.D.
Irenaeus Patristic
c. A.D. 130–202
“It is not possible that the Gospels can be either more or fewer in number than they are. For, since there are four zones of the world in which we live, and four principal winds, while the Church is scattered throughout all the world, and the "pillar and ground" of the Church is the Gospel and the spirit of life; it is fitting that she should have four pillars, breathing out immortality on every side, and vivifying men afresh. From which fact, it is evident that the Word, the Artificer of all, He that sitteth upon the cherubim, and contains all things, He who was manifested to men, has given us the Gospel under four aspects, but bound together by one Spirit. As also David says, when entreating His manifestation, "Thou that sittest between the cherubim, shine forth." For the cherubim, too, were four-faced, and their faces were images of the dispensation of the Son of God. For, [as the Scripture] says, "The first living creature was like a lion," symbolizing His effectual working, His leadership, and royal power; the second [living creature] was like a calf, signifying [His] sacrificial and sacerdotal order; but "the third had, as it were, the face as of a man,"-an evident description of His advent as a human being; "the fourth was like a flying eagle," pointing out the gift of the Spirit hovering with His wings over the Church. And therefore the Gospels are in accord with these things, among which Christ Jesus is seated. For that according to John relates His original, effectual, and glorious generation from the Father, thus declaring, "In the beginning was the Word, and the Word was with God, and the Word was God." Also, "all things were made by Him, and without Him was nothing made." For this reason, too, is that Gospel full of all confidence, for such is His person. But that according to Luke, taking up [His] priestly character, commenced with Zacharias the priest offering sacrifice to God. For now was made ready the fatted calf, about to be immolated for the finding again of the younger son. Matthew, again, relates His generation as a man, saying, "The book of the generation of Jesus Christ, the son of David, the son of Abraham;" and also, "The birth of Jesus Christ was on this wise." This, then, is the Gospel of His humanity; for which reason it is, too, that [the character of] a humble and meek man is kept up through the whole Gospel. Mark, on the other hand, commences with [a reference to] the prophetical spirit coming down from on high to men, saying, "The beginning of the Gospel of Jesus Christ, as it is written in Esaias the prophet,"-pointing to the winged aspect of the Gospel; and on this account he made a compendious and cursory narrative, for such is the prophetical character. And the Word of God Himself used to converse with the ante-Mosaic patriarchs, in accordance with His divinity and glory; but for those under the law he instituted a sacerdotal and liturgical service. Afterwards, being made man for us, He sent the gift of the celestial Spirit over all the earth, protecting us with His wings. Such, then, as was the course followed by the Son of God, so was also the form of the living creatures; and such as was the form of the living creatures, so was also the character of the Gospel. For the living creatures are quadriform, and the Gospel is quadriform, as is also the course followed by the Lord.”
Source
303
A.D.
c. A.D. 250–303
“"The first living creature was like to a lion, and the second was like to a calf, and the third had a face like to a man, and the fourth was like to a flying eagle." And in that the living creatures are different in appearance, this is the reason: the living creature like to a lion designates Mark, in whom is heard the voice of the lion roaring in the desert. And in the figure of a man, Matthew strives to declareto us the genealogy of Mary, from whom Christ took flesh. Therefore, in enumerating from Abraham to David, and thence to Joseph, he spoke of Him as if of a man: therefore his announcement sets forth the image of a man. Luke, in narrating the priesthood of Zacharias as he offers a sacrifice for the people, and the angel that appears to him with respect of the priesthood, and the victim in the same description bore the likeness of a calf. John the evangelist, like to an eagle hastening on uplifted wings to greater heights, argues about the Word of God. Mark, therefore, as an evangelist thus beginning, "The beginning of the Gospel of Jesus Christ, as it is written in Isaiah the prophet; " The voice of one crying in the wilderness," -has the effigy of a lion. And Matthew, "The hook of the generation of Jesus Christ, the son of David, the son of Abraham: " this is the form of a man. But Luke said, "There was a priest, by name Zachariah, of the course of Abia, and his wife was of the daughters of Aaron: " this is the likeness of a calf. But John, when he begins, "In the beginning was the Word, and the Word was with God, and the Word was God," sets forth the likeness of a flying eagle. Moreover, not only do the evangelists express their four similitudes in their respective openings of the Gospels, but also the Word itself of God the Father Omnipotent, which is His Son our Lord Jesus Christ, bears the same likeness in the time of His advent. When He preaches to us, He is, as it were, a lion and a lion's whelp. And when for man's salvation He was made man to overcome death, and to set all men free, and that He offered Himself a victim to the Father on our behalf, He was called a calf. And that He overcame death and ascended into the heavens, extending His wings and protecting His people, He was named a flying eagle. Therefore these announcements, although they are four, yet are one, because it proceeded from one mouth. Even as the river in paradise, although it is one, was divided into four heads.”
Source
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“Both in the prophet Ezekiel and in the Apocalypse of the same John whose Gospel this is, there is mentioned a quadruple beast, having four characteristic faces: a man's, a calf's, a lion's, an eagle's. Very many who have commented on the mysteries of the holy Scriptures before us have understood the four Evangelists in this animal, or rather in these animals. The lion, [they say], has been put for king, because the lion seems to be, in a way, the king of beasts because of his power and terrifying bravery. This character has been attributed to Matthew because he described in proper order the royal line in the generations of the Lord, how the Lord was through royal descent from the seed of King David. But Luke, because he began from the priesthood of the priest Zechariah, making mention of the father of John the Baptist, is accounted the calf because the calf was the important victim in the sacrifice of the priests. Christ as a man has rightly been assigned to Mark, because neither did he say anything about his royal power nor did he begin from the priestly, but he simply started with Christ the man. All of these have practically not departed from the earthly things, that is, from those deeds that the Lord Jesus Christ performed on earth. They said very few things about his divinity, as if they were walking with him on earth. There remains the eagle: it is John, he who preaches the sublime and who gazes with unflinching eyes upon the internal and eternal light.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And the first beast was like a lion,.... And this figure expresses the strength of the ministers of the word, the lion being the strongest among beasts, Pro 30:30, to do the work they are called to, to endure hardness, as good soldiers of Christ, and to bear the infirmities of the weak; and also it denotes their courage and boldness in preaching the Gospel of Christ, without fearing the faces of men, or of being afraid of their revilings: and the second beast like a calf; or "ox", for so the word here used signifies in the Hellenistic language, and with the Septuagint interpreters, and agrees with Eze 1:10, and designs the laboriousness of Christ's faithful ministers in treading out the corn of Gospel truth, who labour in the word and doctrine, and are labourers with God; as also their humility, meekness, and patience in bearing insults, reproaches, and sufferings for Christ, and instructing those that oppose themselves: and the third beast had a face as a man; and points at the humanity and tender heartedness, the wisdom, prudence, knowledge, and understanding, and the use of the reasoning faculty, together with a manly spirit in abiding by the Gospel at any rate; all which are so necessary in the ministers of the word. And the fourth beast was like a flying eagle; which sets forth the sagacity and penetration of Gospel ministers into the deep things of God, and mysteries of grace, and their readiness and swiftness to do the will of God, in publishing the everlasting Gospel; see Rev 14:6.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“The first beast was like a lion - It is supposed that there is a reference here to the four standards or ensigns of the four divisions of the tribes in the Israelitish camp, as they are described by Jewish writers. The first living creature was like a lion; this was, say the rabbins, the standard of Judah on the east, with the two tribes of Issachar and Zabulon. The second, like a calf or ox, which was the emblem of Ephraim who pitched on the west, with the two tribes of Manasseh and Benjamin. The third, with the face of a man, which, according to the rabbins, was the standard of Reuben who pitched on the south, with the two tribes of Simeon and Gad. The fourth which was like a flying (spread) eagle, was, according to the same writers, the emblem on the ensign of Dan who pitched on the north, with the two tribes of Asher and Naphtali. This traditionary description agrees with the four faces of the cherub in Ezekiel's vision. See my notes and diagrams on Numbers 2. Christian tradition has given these creatures as emblems of the four evangelists. To John is attributed the Eagle; to Luke the Ox, to Mark the Lion, and to Matthew the Man, or angel in human form. As the former represented the whole Jewish Church or congregation, so the latter is intended to represent the whole Christian Church.”
Source
1849
A.D.
1774–1849
“Like a lion, &c. The qualities in these animals are observed to be courage and strength in the lion; profit to human life, by the calf; reason and wisdom, by the face of man: soaring high, and rapidity or swiftness, by the eagle: whether we understand those spiritual perfections to belong to blessed spirits, or to the apostles in general, or to the four evangelists. (Witham)”
Source
1863
A.D.
1796–1863
“St. Luke treats of the priesthood of Zachary in the commencement of his Gospel, and is thought to be symbolized by the calf, which was offered in sacri- fice.”
“The sublimity of the Gospel of St. John, who at once soars to the bosom of the Deity, has obtained for him the title of eagle.”
1871
A.D.
1871
“calf--"a steer" [ALFORD]. The Septuagint often uses the Greek term here for an ox (Exo 22:1; Exo 29:10, &c.). as a man--The oldest manuscripts have "as of a man."”

Undated

date unknown
date
unknown
Glossa Ordinaria Medieval
“To a lion. The lion is born dead, and on the third day is quickened by the voice of the Father. So also Christ rose again on the third day; and it behoved him to rise again, because he had died; and it behoved him to die, because man; and having died he both willed and was able to rise again, because an eagle, that is, God.”
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.