In Maimonides day, report came from Yemen of a false-messiah (Samawal al-Maghribi) who was confusing Jews by claiming he was Messiah. Maimonides penned a long, heart-felt, and important letter to Yemen (which is now a book), to convince the Jews in Yemen that Samawal al-Maghribi was a heretic and not the Messiah. His tool for convincing them was some careful and powerful exegesis and interpretation of Isaiah (to include the suffering servant chapter 53) which lends itself to our more advanced, retrospective, perspective. Note is made of our more advanced frame of reference since today we have access to ancient texts and Hebrew exegesis that give us a clearer perspective on exegeting the Hebrew of Isaiah than was available even to the feted (and rightly so) Maimonides.
As for the nature of his appearance, nothing will be known about it before it takes place. The Messiah is not a person about whom it may be predicted that he will be the son of a certain person or from a certain family, on the contrary, he will be unknown before his revelation; and he will validate the truth of his claim and lineage through signs and wonders.
Maimonides, Letter to Yemen.
Two things stand out about Maimonides' statement. We know that Messiah is of the lineage of David, and we know, paralleling Maimonides' statement, that the significant
signs and wonders are related to a "miraculous" conception and birth the deciphering of which will justify his messianic claim by means of how his birth reveals (significantly and wondrously) his linage and its relationship to his messianic claim. The signs and wonders related to the revelation of Messiah's person, come, as Maimonides notes, from the decipherable nature of his miraculous birth as it's discussed throughout the Tanakh with emphasis on Isaiah, and special emphasis on chapter 53 of Isaiah.
Scripture describes his mysterious arrival, saying, "Behold a man whose name is "Shoot" (Zemach), who will spring up out of his place (Zechariah 6:12). Isaiah also describes his emergence without his father or mother being known. "He will rise up like a sapling, [like a root from dry ground]" (Isaiah 53:2).
Ibid.