According to the Book of Mormon, Ammoron (/ˈæm.ɔːr.ɑːn/) was a Nephite traitor. A descendant of Zoram, he succeeded his brother Amalickiah as the king of the Lamanites. Amalickiah, as king, started a major war with the Nephites, which the Nephites had hoped would end with his death. However, Ammoron seized power and continued the war. Eventually his armies were defeated and he was slain by Teancum.
References
Ammoron Wikipedia(Text) CC BY-SA