Samuel Lamanite Wall Mormon
And it came to pass that in this year there was one Samuel, a Lamanite, came into the land of Zarahemla, and began to preach unto the people. And it came to pass that he did preach, many days, repentance unto the people, and they did cast him out, and he was about to return to his own land.
And it came to pass that they would not suffer that he should enter into the city; therefore he went and got upon the wall thereof, and stretched forth his hand and cried with a loud voice, and prophesied unto the people whatsoever things the Lord put into his heart.
Source: The Book of Mormon Online