Alma 17:21

and thus Ammon was carried before the king which was over the land of Ishmael; and his name was Lamoni; and he was a descendant of Ishmael.

So Ammon was taken to the king who ruled the land of Ishmael. His name was Lamoni. He was a descendant of Ishmael.

So Ammon was brought before the king of Ishmael. His name was Lamoni, a descendant of Ishmael.