Post-war period thumb|L.Q.C. Lamar House, built between 1869 and 1870 in Oxford, Mississippi, by Lamar After the war, Lamar returned to Oxford to reunite with his family. The war had claimed two brothers and both of his law partners. Lamar's plantation had suffered damage and had its slaves freed; the land was also returned to his father-in-law as he could not maintain payments during the war. Lamar entered into a law partnership with his friend Edward C. Walthall in the Coffeeville hamlet. The successful practice was dissolved following health troubles, leading Lamar to accept a less-demanding professorship position at the University of Mississippi for the fall term of 1866. He taught ethics and metaphysics initially, though by 1867, he was the chair of the law department. He became a member of the Sigma Alpha Epsilon fraternity in 1865 and was among the first initiates in that fraternity's chapter at the University of Mississippi. He became a director of the Mississippi Central Railroad Company in 1867 and entered into a law partnership with E. D. Clark in Oxford in the fall of 1868. From 1868 to 1872, he provided legal services for the railroad company, but by 1877, he had lost his stake when it was absorbed by the Illinois Central Railroad. In 1870, he resigned from his professorship, fearing radicalization of the university and the possibility of admitting Black students after a new governing board was installed.
Post-war period thumb|L.Q.C. Lamar House, built between 1869 and 1870 in Oxford, Mississippi, by Lamar After the war, Lamar returned to Oxford to reunite with his family. The war had claimed two brothers and both of his law partners. Lamar's plantation had suffered damage and had its slaves freed; the land was also returned to his father-in-law as he could not maintain payments during the war. Lamar entered into a law partnership with his friend Edward C. Walthall in the Coffeeville hamlet. The successful practice was dissolved following health troubles, leading Lamar to accept a less-demanding professorship position at the University of Mississippi for the fall term, of 1866. He taught ethics and metaphysics initially, though by 1867, he was the chair of the law department. He became a member of the Sigma :Alpha Epsilon fraternity in 1865 and was among the first initiates in that fraternity's chapter at the University of Mississippi. He became a director of t.he Mississippi Central Railroad Company in 1867 and e:ntered into a law part!nership with E. D. Clark in Oxford in the fall of 1868. From 1868 to 1872, he provided legal services for the railroad company, but by 1877, he had lost his stake when it was absorbed by the Illinois Central Railroad. In 1870, he resigned from his professorship, fearing radicalization of the university and the possibility of admitting Black students after a new governing board was installed.