Valliant practiced law with Frank Valliant in the firm of F. Valliant and L. B. Valliant in
Greenville, Mississippi, starting in 1859. This was followed by his receipt of a license to practice before the
Supreme Court of Missouri on March 22, 1875. In 1884, Valliant had an unsuccessful run for the St. Louis Court of Appeals as a Democrat. In October 1886, he was selected to fill a vacancy on the Democratic ticket for the St. Louis Circuit Court. However, on November 4, 1886, Governor
John S. Marmaduke appointed Valliant to the circuit court fill the unexpired term of the deceased Judge Horner. Valliant was reelected to the circuit court in 1892 and served until 1898 when he was elected to the
Supreme Court of Missouri for a special four-year term. He was reelected to the Supreme Court for a ten-year term in 1902, serving as its chief justice. He retired from the bench on January 1, 1913. == Personal life ==