Notably that was the dream of king Nebuchadnezzar interpreted by prophet Daniel from verse 38 -45 many years ago when the Jews were captured by the Babylonian empire. Flavius Josephus, a non-christian Jew, ventured to give meaning on this during the reign of emperor Vespasian of the pagan Roman empire, between 69 - 79 A.D., who requested Josephus to give a history of his people. The following were the meanings of the interpretation:
Head of gold - Babylonian empire
Chest and arms made of silver - Medo-Persian empire
Waist and hips made of bronze - Greek empire
Legs of iron, and the feet, partly iron and clay - Roman
These interpretations had been known that the early christians like St. Hippolytus, St. Augustine, St. Thomas Aquinas and even the well known Martin Luther accepted these without unfavorable comment. Meaning to say that these people may have learned that Josephus was right.
If it was so, what makes me wonder are the phrases found in Daniel 2: 34-35 that state "a great stone broke loose from a cliff without anyone touching it, struck the iron and clay feet of the statue, and shattered them. (and in verse 35) “…But the stone grew to be a mountain that covered the whole earth.”
Is the latter verse prophesying the true church, for it was interpreted by Daniel in verse 44 that God would establish a kingdom that will never end? For me the phrase “the stone grew to be a mountain that covered the whole earth” is somewhat prophetical. What can you say?