John the Apostle
Revelation 7:2ESV·traditional attribution

Then I saw another angel ascending from the rising of the sun, with the seal of the living God, and he called with a loud voice to the four angels who had been given power to harm earth and sea,

Matthew Henry Presbyterian @wholebiblehenry

Here we have, I. An account of the restraint laid upon the winds. By these winds we suppose are meant those errors and corruptions in religion which would occasion a great deal of trouble and mischief to the church of God.

Commenting on Revelation 7:1-12

John Gill Reformed Baptist @doctorgill

And I saw another angel,.... Not Constantine, who came from the eastern parts to the empire, with the true knowledge of God, and the authority of God to propagate it; and who repressed the four angels, or evil spirits, contention, ambition, heresy, and war, from doing the mischief they otherwise would; and sealed the saints, by giving them a platform of doctrine at the council...

Albert Barnes Presbyterian @notesbybarnes

Verse 2. And I saw another angel. Evidently having no connexion with the four, and employed for another purpose. This angel, also, must have been symbolic; and all that is implied is, that something would be done as if an angel had done it. Ascending from the east. He appeared in the east, and seemed to rise like the sun.