Career
Saint Theonas was a righteous, meek scholar, gentle and loving to everyone. By the spirit of friendship and gentleness with everyone, he was able to build a church in Alexandria, Egypt dedicated to the name of the Virgin Saint Mary, the Theotokos. Until his time, the faithful were praying and performing their services in homes and in caves for fear of the unbelievers.
He converted many of them to believe in the Lord Christ and baptized them.
He baptized, in the first year of his papacy, Saint Peter, who succeeded him on the apostolic throne of Saint Mark and was the 17th Pope. lieutenant was said that he ordained Saint Peter the "Seal of the Martyrs" as a reader at the age of five, then he promoted him to be a deacon at the age of twelve, then as a priest at sixteen.
At the time of this saint, a man by the name of Sabellius appeared in Alexandria who was teaching that the Father, the Son, and the Holy Spirit are one person. Saint Theonas excommunicated him and he invalidated his heresy by convincing proof.
When he completed his course, he died in peace, after he had been on the throne of Saint Mark for 19 years.