Eliza Roxcy Snow

Eliza Roxey Snow (January 21, 1804 – December 5, 1887) was a Mormon Pioneer, poet, and second Relief Society general president of the Church of Jesus Christ of Latter Day Saints, which she re-established in the Utah Territory in 1866. She was also one of the plural wives of Joseph Smith and then later of Brigham Young after Smith's death. Eliza R. Snow was the older sister of Lorenzo Snow, the LDS Church's fifth president.

In the history of the Church of Jesus Christ of Latter-day Saints, she was a well-known and significant figure. Several Hymns authored by her are still widely sung today in LDS Sacrament Meetings: a notable example of which is the Hymn O My Father, which makes reference to teachings concerning a Pre-Mortal Existence and a Heavenly Mother.

Read more about this composer on Wikipedia.