An Apostle

1. A missionary, or leader of a religious mission, especially one in the early Christian Church (but see Apostle).Apostle - WikipediaApostles in Christianity - Wikipedia
2. A pioneer or early advocate of a particular cause, prophet of a belief.
3. A top-ranking ecclesiastical official in the twelve seat administrative council of The Church of Jesus Christ of Latter-day Saints.
4. (obsolete, Cambridge slang) A person who is plucked, that is, refused an academic degree.^[1]

Synonyms

• disciple