In Rev 12:3 the other sign John saw was a great red dragon meaning Satan. Remember, this is a vision and a sign as Satan has not yet been thrown out of heaven. The description of the dragon being great and red depicts its nature and character as being fierce and murderous, John 8:44. This red dragon is depicted as having seven heads, ten horns, and seven crowns upon his heads. This is also confirmed in Rev 17 as mystery Babylon is described. The seven heads and ten horns refer to the original ten kingdoms of which three were subdued by the little horn of Daniel 7:8. The last kingdom which stands greater than all the others is that of a revived Roman Empire that takes control over all the ten nations who then implements a deceiving peace treaty to a world that is in great distress. Below is that of the seven kingdoms described as four beasts in Daniel 7:1-8 and the three kingdoms that were subdued by the little horn, which is the Roman Empire.
The three kingdoms that were subdued by the little horn of Daniel 7:24 are the Heruli, Vandals, and Ostrogoths who were eliminated by the year 538 AD under the leadership of the Eastern Roman Emperor Justinian whose deadly wound came in 1798.
Seven remaining nations that still exist today:
Babylonian Empire:
(Iraq) The lion represents the winged lions that guarded the royal places of Babylon.
Medo – Persian Empire:
(Iran) The ribs of the bear are part of the consuming greed that devours the first empire.
Grecian Empire:
(Greece, Turkey, Syria, Egypt) Four wings of the leopard described the swiftness of this empire that ran from 334-331BC. It wrestled world dominion from Medo-Persia. After the death of Alexander the Great the kingdom was divided into four minor kingdoms that continued as prominent factors in world politics until the Roman Empire gathered it back as one kingdom.
Roman Empire: (little horn, Daniel 8:9-14, 23-27)
Iron represents the stronghold this nation had. Daniel chapter 2 mentions the iron element of this empire that it to will be divided and broken as God will set up a kingdom that will never be destroyed.
The crowns on its heads show that this dragon claims royal authority against the true King who is God of all creation as he prepares to take his seat above all that which is Gods Kingdom claiming he is God as he prepares to deceive the world through that of an existing Roman Empire, Daniel 8:9-12; Isaiah 14:12-15.
The beast rises up out of the sea as the sea here is symbolic of people and nations as in a sea of humanity, Daniel Chapter 7:1-8; Revelation 17:15. The seven heads are that of the Babylonian Empire, Medo/Persian Empire and Grecian Empire and Roman Empire. The ten horns represent the nations the Roman Empire scattered to when the deadly wound was put upon them, Daniel 7:23-25.
These ten nations were the Anglo-Saxons (English), the Franks (French), Suevi (Portuguese), Visigoths (Spanish), Burgundians (Swiss), Alemanni (Germans), Lombards (Italians), Ostrogoths, Heruli, and the Vandals in northern Africa. The last three being Ostrogoths, Heruli, and the Vandals had already been destroyed by the Roman Empire before their deadly wound came in 1798.
The beast out of the earth, Rev 13:11-18, is the revived Roman Empire (mystery Babylon) which causes man to take its mark, Daniel 7:24, 25 and another shall rise after them; and he shall be diverse from the first, He will think to change times and laws: and they shall be given into his hand until a time and times and the dividing of time.