After the last of Jesus’ original twelve apostles died, Mormons believe a Great Apostasy occurred. This was a period of spiritual darkness where people had lost the “fulness of the gospel truth.” It was not until Heavenly Father and Jesus Christ appeared to a young Joseph Smith in the early 19th century that the fulness of the gospel was restored. Mormons believe these teachings had been lost over the course of centuries and now can be found in Mormon Scriptures. For these reasons, the LDS Church considers itself the only true Christian church. Mormons refer to the Restoration as Protestants refer to the Reformation, but only much stronger.