US Congressman, Lawyer. He was a United States Representative from the State of Iowa. He was born one of four children as Lucien Lester Ainsworth to Parmenas Ainsworth (1807-1901), and his wife Kezia Webber Ainsworth (1811-1847), in New Woodstock, New York, on June 21, 1831. His mother Keziah passed away in 1847, and his father Parmenas married a woman named Amanda Carpenter in Cazenovia, New York, on November 2, 1848, and they had one child together, a daughter named Ella Kezia Ainsworth who was born on November 15, 1850. He was educated locally and attended the local common public schools and the prestigious Oneida Conference Seminary in Cazenovia, New York. During intervals, he also taught school at the Oneida Conference Seminary, in Cazenovia, New York, and was said to be a very popular teacher and educator. Following his education, he then studied law, was admitted to the bar in Madison County, New York, in 1854 at the age of 23, and then moved to Belvidere, Illinois, where he commenced his practice of law shortly thereafter. He then moved to the State of Iowa and continued his practice of law after settling in West Union in 1855. He then became interested in politics and ran for the office of Fayette County, Iowa, Attorney as a Member of the Democrat Party in 1856, and then ran and was elected and served a term as a Member of the Iowa State Senate representing Bremer County, Iowa, and Fayette County, Iowa, from 1860 to 1862. Following the outbreak of the American Civil War, he entered the Union Army with the rank of Captain of Company C, Sixth Regiment, Iowa Volunteer Cavalry, and served his country for three years fighting conflicts against the Native American Indian Tribes in the Northern Great Plains, most notably participating with his company in the Battle of Whitestone Hill in Dakota Territory. Following his military service, he once again resumed his practice of law in West Union, Iowa, and continued with his interests in politics. He then served as a Member of the Iowa State House of Representatives from 1871 to 1873. He then decided to run for a seat in the United States Congress and was elected to succeed the outgoing United States Representative William G. Donnan (1834-1908), on March 4, 1875. A Member of the Democratic Party, he then served Iowa's 3rd District (Forty-Fourth Congress), in the United States House of Representatives from March 4, 1875, to March 3, 1877. He declined to accept a nomination for reelection in 1876. Following his term in the United States Congress, he was succeeded in office by the incoming United States Representative Theodore Weld Burdick (1836-1898), on March 4, 1877. After leaving the United States Congress, he once again resumed his practice of law in West Union, Iowa, during this time he had two interesting law cases, In 1885, "We find the following local item telegraphed to the Cedar Rapids Republican from Fayette, on March 6, 1885. The saloon of Simon Nefzger, at Lima, in this county, was raided the night before last, and a small quantity of whisky was found yesterday morning. Nefzger and his clerk were both arrested for selling and the trial was fixed for today. They came by their attorney, L. L. Ainsworth, of West Union, proposing to quit the business totally and forever and pay all costs and expenses, including attorney for prosecution. Being satisfied that the proposition was made in good faith and would be adhered to, the prosecution did not appear. The costs were promptly paid and there is one less saloon in Iowa. It does prohibit." In 1890, he was involved in, "A grave-stone lawsuit was in progress here last week between J. O. VanSyckel and some parties Strawberry Pointward, which lasted a couple of days. L.L. Ainsworth chopped up law for VanSyckel, and attorney Blair, of Manchester, assisted the defense." He continued with his law practice until his death. He passed away following a lingering illness caused by liver and kidney troubles in West Union, Iowa, on January 2, 1902, at the age of 70. Following his funeral service, which was attended by his family members, friends, esteemed colleagues, and members of his former company from the Civil War, he was buried in the family plot in West Union Cemetery in West Union, Iowa. He was married to Margaret E. McCool Ainsworth (1833-1921), the daughter of Joseph McCool and his wife Eleanor Nevius McCool, on December 8, 1859, and the couple had five children together Fred Lee Ainsworth (1873-1906), Charles Gray Ainsworth (1866-1868), Porter Lester Ainsworth (1868-1932), Walter Joseph "Willard" Ainsworth (1870-1926), James W. Ainsworth (1861-1917), and Lucretia Eleanor Ainsworth White (1863-1941). His wife Margaret passed away on March 17, 1921, at the age of 87, and she is buried in the family plot with her husband in West Union Cemetery in West Union, Iowa.