Samuel Harrison Smith was a younger brother of Joseph Smith, founder of the Latter Day Saint movement. Samuel was a leader in his own right and a successful missionary. Smith is commonly regarded as the first Latter Day Saint missionary following the organization of the Church of Christ by his brother, Joseph. One of the Eight Witnesses to the Book of Mormon's golden plates, Samuel Smith remained devoted to his church throughout his life.

The Church of Christ was the original name of the Latter Day Saint church founded by Joseph Smith. Organized informally in 1829 in upstate New York and then formally on April 6, 1830, it was the first organization to implement the principles found in Smith's newly published Book of Mormon, and thus its establishment represents the formal beginning of the Latter Day Saint movement. Later names for this organization included the Church of the Latter Day Saints, the Church of Jesus Christ, the Church of God, the Church of Christ of Latter Day Saints, and the Church of Jesus Christ of Latter Day Saints.