Virtually no ancient rabbinical writer denied that the subject of the two lines of prophecy was a Messianic figure. However, they simply could not envision how one individual, in one lifetime, could both rule and reign on the throne of David forever and ever, and yet be despised rejected, suffer and die. Consequently , they conceived to split the Messiah in two, creating one Messiah for each line of prophecy. However, as we shall see, one individual could accomplish both lines of prophecy. This requires one caveat: He would have to come twice.! (The Search for Messiah, Eastman, Smith, page 119,120).They conclude that history has shown that there are not "two Messiahs" but one Messiah with two missions and two "comings".
It remained to the Psalms of Solomon (ca. 48 B.C.) to provide the one confirmed and repeated evidence of the technical use of the term [Messiah] in the intertestamental literature. This literature demonstrates, therefore, a diffuse expectation about the Messiah. It speaks of a Messiah of David, of Levi, of Joseph, and Ephraim. The Dead Sea Scrolls add to the confusion by referring to a Messiah of Aaron and Israel. (Evangelical Dictionary of Theology, 711)