Speculations about the identity of the beast are rampant.
Anti-Catholics frequently identify it with a future “restored Roman Empire,” which they also wish to connect in one way or another with the Catholic Church.
The four beasts in reference to Revelation 13 are past pagan kingdoms that persecuted and conquered God’s people, Israel.
Furthermore, the study of Rev 13 has many variables in which delve into to the Book of Daniel.
Truthfully, it would be best to review the following article for a more complete answer.
https://www.catholic.com/magazine/print-edition/the-beast-in-revelation