13 Now these things we teach, not of our own invention, but having learned them out of the divine Scriptures used in the Church, and chiefly from the prophecy of Daniel just now read; as Gabriel also the Archangel interpreted it, speaking thus: The fourth beast shall be a fourth kingdom upon earth, which shall surpass all kingdoms. And that this kingdom is that of the Romans, has been the tradition of the Church's interpreters. For as the first kingdom which became renowned was that of the Assyrians, and the second, that of the Medes and Persians together, and after these, that of the Macedonians was the third, so the fourth kingdom now is that of the Romans. Then Gabriel goes on to interpret, saying, His ten horns are ten kings that shall arise; and another king shall rise up after them, who shall surpass in wickedness all who were before him; (he says, not only the ten, but also all who have been before him;) and he shall subdue three kings; manifestly out of the ten former kings: but it is plain that by subduing three of these ten, he will become the eighth king; and he shall speak words against the Most High. A blasphemer the man is and lawless, not having received the kingdom from his fathers, but having usurped the power by means of sorcery.
Source: Catechetical Lectures (New Advent)