The First Beast is the Roman Empire, especially Nero. The Second Beast is Apostate Judaism (i.e., the Jewish priests and leaders who opposed Christianity).
But Revelation also functions as a metaphor for every age. Thus, the First Beast is every political or secular authority that opposes Christianity. And the Second Beast is every religious leader that opposes or subverts Christianity.
Your Catholic Bible, that taught the Bible ended at Patmos is why the Social Gospel and socialism took root in the Christian church.
Like Pope Francis?