LDS History, Aug 12, 1844

-- Aug 12, 1844
[Quorum of the Twelve] Amasa M. Lyman returned to the Quorum. (1)

[Wilford Woodruff] Accepts a call to preside over the European Mission. (2)

-- Aug 20, 1844
[Lucy Mack Smith] Lucy J. Clark Smith, the third daughter of Samuel Smith and Levira Clark Smith, is born. She is Samuel's seventh child. (3)

-- Aug 24, 1844
[Lucy Mack Smith] William Smith writes to Brigham Young, saying he wants to be a "spiritual father" to the church, like Hyrum. (3)

-- Sep 28, 1844
[Lucy Mack Smith] Brigham Young affirms to William that the patriarchal right "rests upon your head" although he suggests "you can bestow it upon Uncle John or Uncle Asael." (3)

-- During Sept. 1844
[Lucy Mack Smith] Probably because Emma Smith is due to deliver David Hyrum in two months, Lucy moves in with Arthur Millikin and Lucy Smith Millikin. (3)

-- Oct 6, 1844
[Lucy Mack Smith] Brigham Young is sustained as president of the Twelve. (3)

-- Oct 22, 1844
[U.S. Religious History] The "Great Disappointment" occurred when the return of Christ, predicted by William Miller, failed to happen once again. At least 100,000 disillusioned followers returned to their former churches or abandoned Christianity completely - but many went on establish what would become known as the Adventist Churches. (4)

-- During 1844 October
The first General Conference of the church under Brigham Young's direction is held. (5)

-- Nov 10, 1844
[Lucy Mack Smith] William Smith, writing from New Jersey, asks W. W. Phelps to visit Lucy and give her "a word of consolation from me" and also to visit his sisters. (3)

-- Nov 17, 1844
[Lucy Mack Smith] Birth of David Hyrum Smith, son of Joseph and Emma. (6)

[Lucy Mack Smith] Emma gives birth to David Hyrum Smith at Nauvoo, her ninth biological child and eighth son. late 1844-early 1845 Lucy begins dictating her memoirs to Martha Jane Knowlton Coray. (3)

-- Dec 25, 1844
[Lucy Mack Smith] W. W. Phelps reports that Lucy, to whom he read William's letter, "cried for joy" and "blessed" him in the name of the Lord. (3)

-- 1844
Church Membership at end of year: 26,146
New Converts : 166
Percent Change from previous year: 0.64% (7)

-- During 1844-47
Joseph Smith is martyred. Brigham Young leads the Church as President of the Quorum of the Twelve. (8)

-- During 1844-1845
[Deseret] Miles Goodyear builds Fort Buenaventura. (9)

1 - Wikipedia, Chronology of the Quorum of the Twelve Apostles (LDS Church),
2 - Church of Jesus Christ of Latter-day Saints, Teachings of Presidents of the Church: Wilford Woodruff, Salt Lake City, Utah
3 - Anderson, Lavina Fielding, Editor, Lucy's Book: A Critical Edition of Lucy Mack Smith's Family Memoir, 2001, Signature Books
4 - Cline, Austin, History of American Religion: Timeline,
5 - Wikipedia, 19th Century (Mormonism),
6 - Proctor, Scott and Maurine Jensen, editors, History of Joseph Smith by His Mother: Revised and Enhanced
7 - Wikipedia, The Church of Jesus Christ of Latter-day Saints Membership History,
8 - Church of Jesus Christ of Latter-day Saints, Teachings of Presidents of the Church: Brigham Young, Salt Lake City, Utah
9 - History to Go, Trappers, Traders and Explorers,
Mormon History Timeline /Chronology