John the Apostle
Revelation 16:9ESV·traditional attribution

They were scorched by the fierce heat, and they cursed the name of God who had power over these plagues. They did not repent and give him glory.

Matthew Henry Presbyterian @wholebiblehenry

In these verses we see the work going on in the appointed order. The fourth angel poured out his vial, and that fell upon the sun; that is, say some, upon some eminent prince of the popish communion, who should renounce their false religion a little while before his utter downfall; and some expect it will be the German emperor. And now what will be the consequence of this?

Commenting on Revelation 16:8-11

John Gill Reformed Baptist @doctorgill

And the fifth angel poured out his vial upon the seat of the beast,.... The beast is the same with that in Rev 13:1 and which again shows that to be one and the same: the seat or throne of the beast is Rome, which, when the empire was Pagan, was the seat of Satan, or the dragon, Rev 2:13 and when the beast or...

Albert Barnes Presbyterian @notesbybarnes

Verse 9. And men were scorched with great heat. That is, as above expressed, calamity came upon them which would be well represented by such heat. It is said that this calamity would come upon men, and we are to suppose that it would be such that human life would be particularly affected; and as that heat of the sun must be exceedingly intense which...