There were many promises and prophesies in scripture of a long awaited king that would sit on the throne of David and rule over Israel. He would bring salvation and prosperity to his people. Jesus Christ is that promised king, though his kingdom was not what Israel expected, and he is the true ruler over all things.
"But you, O Bethlehem Ephrathah, who are too little to be among the clans of Judah, from you shall come forth for me one who is to be ruler in Israel, whose coming forth is from of old, from ancient days." Micah 5:2