John the Apostle
Revelation 13:3BSB·traditional attribution

One of the heads of the beast appeared to have been mortally wounded. But the mortal wound was healed, and the whole world marveled and followed the beast.

Matthew Henry Presbyterian @wholebiblehenry

We have here an account of the rise, figure, and progress of the first beast; and observe, 1. From what situation the apostle saw this monster. He seemed to himself to stand upon the sea-shore, though it is probable he was still in a rapture; but he took himself to be in the island Patmos, but whether in the body or out of the body he could not tell. 2.

Commenting on Revelation 13:1-10

John Gill Reformed Baptist @doctorgill

And I saw one of his heads,.... Not the Capitoline mountain, or the Capitol, the temple of Jupiter, built on that hill, which was burnt by lightning in the times of Titus, and magnificently rebuilt by Domitian, which was a thing past, and of no such moment as to be taken notice of here; nor anyone of the Roman emperors particularly, as Julius Caesar, at...

Albert Barnes Presbyterian @notesbybarnes

Verse 3. And I saw one of his heads, as it were wounded to death. The phrase "wounded to death" means properly that it received a mortal wound; that is, that the wound would have been mortal if it had not been healed. A blow was struck that would be naturally fatal, but there was something that prevented the fatal result.