According to the Book of Mormon

Book of Mormon

The Book of Mormon is a sacred text of the Latter Day Saint movement that adherents believe contains writings of ancient prophets who lived on the American continent from approximately 2600 BC to AD 421. It was first published in March 1830 by Joseph Smith, Jr...

, Aaron was a Nephite

Nephite

According to the Book of Mormon, a Nephite is a member of one of the four main groups of settlers of the ancient Americas. The other three groups are the Lamanites, Jaredites and Mulekites. In the Book of Mormon, the Nephites were a group of people descended from or associated with Nephi, the...

 missionary and one of the sons of King Mosiah. He was also brother to the prophet Ammon

Ammon (Book of Mormon)

This article is about the prominent Book of Mormon missionary. For the Book of Mormon explorer, see Ammon Ammon is a missionary in the Mormon religious text, Book of Mormon and a contemporary of Alma the Younger. The Book of Mosiah describes his original antipathy toward the Nephite Church of God...

. As related in the Book of Mormon narrative, Aaron and his three brothers (Ammon, Omner

Omner

According to the Book of Mormon, Omner was a Nephite missionary and one of the sons of King Mosiah. He was also brother to the prophet Ammon. As related in the Book of Mormon narrative, Omner and his three brothers , left their father, and his people, to travel to the land of the Lamanites in...

, and Himni

Himni

According to the Book of Mormon, Himni was a Nephite missionary and one of the sons of King Mosiah. He was also brother to the prophet Ammon. As related in the Book of Mormon narrative, Himni and his three brothers , left their father, and his people, to travel to the land of the Lamanites in...

), left their father, and his people, to travel to the land of the Lamanite

Lamanite

According to the Book of Mormon, a Lamanite is a member of a dark-skinned nation of indigenous Americans that battled with the light-skinned Nephite nation...

s in order to preach the gospel to them.

During their sojourn there, Aaron was imprisoned and beaten, but eventually aided in the conversion of thousands of Lamanites, who later became the Anti-Nephi-Lehis

Ammonites (Book of Mormon)

According to the Book of Mormon, the Ammonites were a group of Lamanites who had been converted to the Christian religion of the Nephites by the missionary efforts of Ammon and his brothers. They rejected the traditions of their fathers and embraced the traditions of the Nephites. To distinguish...

.