Tertullian (160–225 CE), the famed apologist, was more specific and identified the act of baptism as the Christian sacramentum and contrasted it to a Roman soldier’s pledge of loyalty to the emperor and Empire.19 By analogy, he makes the case that just as a soldier, upon his oath of allegiance, was inducted into Caesar’s army, so a believer was initiated by the sacrament (oath) of baptism into God’s kingdom. Each vowed faithful service to his god and kingdom. Tertullian also included the Eucharist