A Dictionary of the Book of Mormon/Antiomno
ANTIOMNO. A king of the Lamanites who reigned over the land of Middoni, in the early part of the first century before Christ, It was in his realm that Aaron, the son of Mosiah, and some of his fellow missionaries were imprisoned for many days, and afterwards delivered through the intercession of Ammon and king Lamoni. Antiomno is not again mentioned by name, but as we are informed that among the thousands of the Lamanites converted to the Lord, by the preaching of the sons of Mosiah, were they “who were in the land of Middoni,” it is quite probable that their king was also numbered among the converted. Before the coming of Aaron and his associates into their midst the people of Middoni were a hard-hearted and stiff-necked race, and it would be doing no violence to the law of probabilities to imagine that the character of the king was similar to that of his subjects; at any rate he permitted his Nephite prisoners to be treated with much cruelty.