Jacob (Book of Mormon)
In the Book of Mormon, Jacob (Hebrew יעקב Yaʿăqōḇ "Holder of the heel; supplanter") is a younger brother of the prophet Nephi, and becomes the prophet himself after Nephi's death. The Book of Jacob is written by him.
According to the "First Book of Nephi", Jacob's father, Lehi recieved a revelation that he was to leave with his family to avoid the imminent destruction of Jerusalem around 600 BC. Being obedient, Lehi left with his wife, Sariah, and his sons, Laman, Lemuel, Sam. While in the wilderness, Jacob and Joseph were born. Jacob and his family eventually travelled to the Americas via boat constructed by his brother, Nephi. Jacob went on to be a righteous leader, and succeeded Nephi as prophet. Jacob is the author of the Book of Jacob in the Book of Mormon.
Jacob taught many things to the ancient Nephites. Among them was the Parable of the Olive Tree, which talked of the scattering and gathering of Israel. He also taught that polygamy was not to be practiced by the Nephites, unless directed by God via revelation.