One of the great proofs that Joseph Smith was a true prophet is the fact that when John restored the Aaronic Priesthood to the earth, he said "Upon you my fellow servants in the name of Messiah (not "the messiah" or "Jesus Christ" but the plural, "of Messiah" indicating an office, held by two, saith the Lord.
I found this from a Jewish website:
Jewish tradition sometimes refers to two redeemers, each being called "Messiah" (i.e., Mashiach). Both of these redeemers are involved in delivering Israel from galut (exile) and ushering in the long-awaited Messianic era. These two Messiahs are called Mashiach ben David , "the Messiah the descendant of David," and Mashiach ben Yosef , "the Messiah the descendant of Joseph," respectively.
Paul said of this,
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