The eldest child of Gustavus Adolphus Parsons and his wife Patience Monroe Bishop, Mosby Monroe Parsons was born in
Charlottesville, Virginia. When he was 13, his parents moved to
Cole County, Missouri. Two years later, they moved again to
Jefferson City, which Parsons would thereafter make his home. As a young man, Mosby
read law and was admitted to the bar in 1846. He served as a volunteer in the
Mexican–American War with the rank of captain in Colonel
Alexander W. Doniphan's regiment and was cited for gallantry at the
Battle of Sacramento on February 28, 1847. Returning to Missouri after the war, Parsons married Mary Wells on September 18, 1850. However, his wife died just three years later, leaving him with an infant son, Stephen Kearney Parsons. Parsons served as the United States
District Attorney for western Missouri. In 1856, he was elected to the state legislature. He became a
Missouri state senator in 1858, serving until the American Civil War. == American Civil War ==