Moroni is the last prophet and author of the last book in the Book of Mormon. His life spanned the latter part of the fourth century and the early fifth century. He led ten thousand troops in the last battle against the Lamanites, serving under his father Mormon, who was commander in chief of the Nephite forces. Prior to the final war, Mormon had abridged the plates of Nephi that covered a thousand years of his people's history. He commanded Moroni to conclude the Nephite record by writing "the sad tale of the destruction of [their] people" (Mormon 8:3) and to preserve all the sacred writings (Moroni 9:24).
After Moroni wrote the required postscript to his father's record and prophesied its future discovery (Mormon 8-9), he also recorded prophecies of the Brother of Jared, a Jaredite prophet, who helped lead his colony to the New World. These prophecies are sealed to come forth at a future day (Ether 4:1-7).
Moroni's last entry in the Book of Mormon was likely written about A.D. 421, thirty-six years after the final battle. He then finished writing the title page of the Book of Mormon and finally buried the Book of Mormon plates to preserve them for a future generation.
Fourteen hundred years later this same Moroni, then a resurrected being sent from the presence of God, appeared to Joseph Smith, a seventeen-year-old youth, on the night of September 21, 1823, and told him of the sacred records deposited in a stone box in a nearby hill (the hill Cumorah) in what is now Ontario County, New York, within a few miles of Joseph's home in Manchester Township. Moroni appeared to Joseph more than twenty times during the next six years, tutoring him for his calling as a prophet and giving counsel and information concerning the acquisition, translation, and guardianship of the Book of Mormon plates (Joseph Smith—History 1:27-54).
Moroni is frequently identified with the Church of Jesus Christ of Latter-Day Saints. Portrayals of him blowing a trumpet, handling the gold plates, or instructing Joseph Smith are commonly displayed—for instance on LDS temple spires, on covers of several printings of the Book of Mormon, and in paintings. A depiction of Moroni with a trumpet is the official emblem on grave markers of American Mormon servicemen.
Moroni is commonly portrayed with a trumpet because of an interpretation of a prophecy of John the Revelator wherein he saw an angel heralding the return of the everlasting gospel to the earth in the last days:
And I saw another angel fly in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people, saying with a loud voice, Fear God, and give glory to him; for the hour of his judgment is come: and worship him that made heaven, and earth, and the sea, and the fountains of waters [Rev. 14:6-7].
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