Antionah was a chief ruler among the people of Ammonihah who questioned Alma the Younger during his preaching there, around 82 B.C. He challenged Alma on whether man could rise from the dead and be changed from a mortal to an immortal state, and asked what the scripture meant in saying that God placed cherubim and a flaming sword east of the garden of Eden to keep Adam and Eve from the tree of life, concluding that they therefore had no chance to live forever (Alma 12:20-21).
Alma answered that this was the point he was about to explain: if Adam had partaken of the tree of life after the Fall, there would have been no death and God’s word that he should die would have been void. Instead a space was granted in which man might repent, making this life a probationary state to prepare to meet God (Alma 12:24). Alma went on to teach that the Lord ordained priests after the holy order of the Son of God to teach the people to look to his Son for redemption, and cited Melchizedek, king of Salem and high priest after that order, to whom Abraham paid tithes (Alma 13:1-19).
After Alma finished, many of the people believed and began to repent, but the greater part wanted to destroy Alma and Amulek; among those who came to believe was Zeezrom (Alma 14:1-2).