Apostle/əˈpɑːsl/ Definition 1 of 4Pro Tip 1/3Historical Figures Apostles in the Christian context refer to specific historical figures, not just any follower. Matthew, an apostle, was also a tax collector. Pro Tip 2/3Not Title 'Apostle' is not just a title; it implies a role in spreading Christianity. Thomas, the apostle, journeyed far to share his faith. Pro Tip 3/3Capitalization When referring to the original twelve, 'Apostle' is often capitalized. The Apostle John wrote several books of the New Testament.