Roberts was born in Warrington, Lancashire, England, the son of Benjamin Roberts, an alcoholic blacksmith and ship plater, and Ann Everington, a seamstress. In the year of his birth both parents converted to the LDS Church. Benjamin Roberts then abandoned his family. Roberts later wrote, "My childhood was a nightmare; my boyhood a tragedy."

Roberts wrote two biographies, a novel, eight historical narratives and compilations, and another dozen books about Mormon theology. In the late 1890s, he also helped establish the Improvement Era and became the de facto editor of this official periodical of the LDS Church. Roberts's six-volume History of the Church of Jesus Christ of Latter-day Saints: Period I, History of Joseph Smith, the Prophet by Himself featured "critical notes, new documents, sidebar headings for most paragraphs, and extensive interpretive essays that introduced each volume. Unfortunately, Roberts continued the confusing structure of the original, where various documents were spliced together and inaccurately attributed to Joseph Smith." Roberts served as Assistant Church Historian from 1902 until his death in 1933.  Roberts wrote a novel Corianton (1889), published serially in The Contributor, and based on the story of Corianton, the son of Alma as told in the Book of Mormon. Though melodramatic and overly didactic, the novel has also been regarded as providing deep and useful portrayals of some of the characters. It was later adapted, along with Julia A. MacDonald's A Ship of Hagoth, into a play by Orestes Utah Bean, and it was the inspiration for the 1931 film Corianton: A Story of Unholy Love.  Roberts's most important work was a comprehensive treatment of Mormon history, which he began in 1909 as a series of monthly articles for a non-Mormon magazine. Roberts repeatedly (and for many years, unsuccessfully) asked church leaders to republish the articles as a multi-volume set. Finally, in 1930 the church agreed to publish it during its centennial celebration. The six-volume Comprehensive History of the Church of Jesus Christ of Latter-day Saints: Century I (3,459 pages) covered for the first time many late-19th- and early-20th-century developments. Further, although its viewpoint was "unabashedly Mormon", Roberts "disdained ... faith promoting myths" and "was a partisan, not an unquestioning apologist."  Roberts "frequently took a broader view" of the place of the LDS Church "in the heavenly scheme of things than did some of his colleagues. In 1902 he told the Saints that 'while the Church of Jesus Christ of Latter-day Saints is given a prominent part in this great drama of the last days, it is not the only force nor the only means that the Lord has employed to bring to pass those things of which His prophets in ancient times have testified.'" Roberts' theology included belief in "the modern liberal doctrine of man and the optimism of the nineteenth century, and it required a bold, rebellious and spacious mind to grasp its full implication."  Roberts hoped that the church would publish his most elaborate theological treatise "The Truth, The Way, The Life", but his attempt to use contemporary scientific theory to bolster Mormon doctrine led, in 1930, to a conflict with Mormon apostle Joseph Fielding Smith, who had been influenced by the writings of young earth creationist George McCready Price. Smith publicly opposed Roberts's quasi-evolutionary views in deference to a literal reading of both the Bible and the Mormon scriptures. The controversy was debated before the Quorum of the Twelve Apostles, and it "declared a draw: Neither the existence nor the nonexistence of pre-Adamites would constitute church doctrine." "The Truth, The Way, The Life" was not published until 1994.

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