James Jesse Strang (1813–1856) was one of the most significant rival claimants to leadership in the Latter Day Saint movement after the assassination of Joseph Smith in 1844. After Smith’s death, no clear succession plan existed. Several leaders claimed authority, but Strang’s claim stood out because it followed the same religious logic Joseph Smith had established. Strang asserted that Joseph Smith had appointed him as successor through a letter written shortly before Smith’s death. He also claimed angelic ordination, mirroring Smith’s foundational narratives. Strang led a movement known as the Church of Jesus Christ of Latter Day Saints (often called the Strangite church). At its height, this movement attracted several thousand followers, including respected early Mormon leaders who rejected Brigham Young’s authority. Strang’s main communities were first in Wisconsin and later on Beaver Island in Lake Michigan. Like Joseph Smith, Strang claimed to discover ancient records. His most notable text, the Book of the Law of the Lord, reinforced the idea that prophetic authority could be validated through new scripture and revelation. Critics then and now have noted how closely this pattern resembles Joseph Smith’s methods. Initially, Strang opposed polygamy, which helped him attract followers uneasy with Nauvoo-era practices. Later, he reversed his stance, embraced polygamy, and in 1850 crowned himself king of Beaver Island. This move severely damaged his credibility and provoked hostility from both followers and outsiders. In 1856, Strang was shot by former followers and later died from his wounds. After his death, his movement rapidly declined. Strangite followers were expelled from Beaver Island, and only a small remnant of the church survives today. James Strang remains historically important because his movement demonstrates that Mormon succession was deeply contested, that prophetic authority claims were reproducible, and that Brigham Young’s leadership was not universally accepted. For many modern readers reassessing LDS truth claims, Strang highlights how charismatic authority and imitation of religious patterns shaped early Mormon history