Amos Cooper Dayton (1811–1865) was a physician, Baptist minister, author, editor and educator, perhaps best remembered for his religious novels of the late 1850s and his role in the Landmark Baptist movement.
Dayton was born at Plainfield, New Jersey, April 1, 1811, the son of Robert Dayton and his wife. He attended local common schools, then went to college. Dayton graduated from medical college in 1834.
Dayton married Lucinda H. Harrison and they had children together.
By 1839 Dayton and his wife had moved to Mississippi, where they lived in Columbus and Vicksburg, while he had a practiced as a dentist. He stayed there until 1852. Dayton was reared Presbyterian, but was influenced by meeting J.R. Graves. He united with the Baptists in 1852.
J. R. Graves, Dayton, and James Madison Pendleton were known as "The Great Triumvirate" of the Landmark movement. From 1854 through 1858, Dayton was the corresponding secretary of the Southern Baptist Convention Bible Board. He moved with his family to Nashville, Tennessee to take the position. Both Graves and Dayton were members of the First Baptist Church of Nashville.
Dayton made significant contributions to the Landmark movement of the mid-nineteenth century in the area of religious fiction, which "popularized Landmark tenets." His most serious novel, Theodosia Ernest, or, The Heroine of Faith, was published in 1856-1857 in two volumes. The first volume presented issues related to baptism, and the second discussed church polity. Theodosia Ernest originally appeared as a series in The Tennessee Baptist in 1855.
In 1857, R.B.C. Howell, a critic of Landmarkism, became pastor for a second tenure at First Baptist of Nashville, where he served until 1868. Howell had a struggle for control with Graves, described as the greatest controversy for the Southern Baptists until the "fundamentalist-moderate" controversy of the last decades of the twentieth century. It resulted in arguments over church discipline, and Graves' being excluded from the church and Dayton's being forced to resign from the Bible Board.