John the Apostle
Revelation 13:16BSB·traditional attribution

And the second beast required all people, small and great, rich and poor, free and slave, to receive a mark on their right hand or on their forehead,

Matthew Henry Presbyterian @wholebiblehenry

Those who think the first beast signifies Rome pagan by this second beast would understand Rome papal, which promotes idolatry and tyranny, but in a more soft and lamb-like manner: those that understand the first beast of the secular power of the papacy take the second to intend its spiritual and ecclesiastical powers, which act under the disguise of religion and charity to the souls of men. Here observe, I.

Commenting on Revelation 13:11-18

John Gill Reformed Baptist @doctorgill

And that no man might buy or sell,.... Either in an ecclesiastical sense, as to, be in any church office, or perform any such service, to say Mass, hear confession, give absolution, sell pardons and indulgences, &c. or in a civil sense, as to trade, and exercise merchandise, and this was forbidden by several Popish councils and synods; the Lateran council, under Pope Alexander, decreed...

Albert Barnes Presbyterian @notesbybarnes

Verse 16. And he caused all. He claims jurisdiction, in the matters here referred to, over all classes of persons, and compels them to do his will. This is the second beast, and, according to the interpretation given above, it relates to the Papal power, and to its claim of universal jurisdiction. Both small and great.