Hannibal Honestus (Honostus) Boone, lawyer, Confederate Army officer, and Texas attorney general, one of two sons of Joseph Green(e) and Harriet N. (Latham) Boone, was born in Tipton County, Tennessee, on February 24, 1834. By 1842 the family had moved to De Soto County, Mississippi. In 1852, after his mother's death, Boone's family moved to a site in Austin (now in Waller) County, Texas. Boone attended Mountain Academy in Tipton County, Tennessee. He then studied law at Austin College in Huntsville, Texas. He quit school four months before graduation when his father became ill, but he did eventually obtain his license to practice law. For the next four years Boone managed his father's plantation; in 1859 he began his legal practice at Hempstead. Sometime before December 1861 he married Harriet Rebecca Fullinwieder, with whom he had one daughter.
In February 1861 Boone enlisted as a private in Col. John S. Ford's regiment of the Confederate Army and served for a time on the Rio Grande frontier. Upon his return from that campaign, he enlisted in Capt. W. A. McDade's company, with which he served at Dickinson's Bayou and around Galveston. On July 4, 1862, he left Hempstead for Louisiana with five companies under Maj. Edwin Waller. Though he entered Waller's unit as a second lieutenant, he was shortly promoted to major and with Waller's Thirteenth Texas Cavalry was attached to Green's (formerly Sibley's) Brigade, with which he saw action along the Louisiana-Texas-Arkansas border. As Waller's executive officer Major Boone led Waller's Thirteenth Texas Cavalry Battalion (which became Waller's Cavalry Regiment around December 1864) in the commander's absence. Boone was wounded on September 29, 1863, at Fordoche, Louisiana, and lost his right arm and the first two fingers and thumb of his left hand. He was subsequently transferred back to Texas, where he served post duty under Gen. John Bankhead Magruder, commander of the Department of Texas, for the remainder of the war. Boone became engaged to Susan H. Gordon in 1863, and they were married in November of that year.
After the war they moved to Anderson, Texas, where Boone practiced law in partnership with Isham G. Searcy. Boone was elected attorney general of Texas on the Democratic ticket in 1876 and served one term. When that ended in 1878, he moved to Navasota and resumed his law practice. He organized one of the first camps of Confederate veterans there and was elected commander of the Division of Texas at the reunion of the United Confederate Veterans in May 1895. Boone and his wife had a large number of children. He continued to practice law in Navasota until his death there, on May 23, 1897.