Mrs. Duval was born in Maryland and was the daughter of Marcus McCausland, a successful Baltimore brewer. In 1818, she married Edmund Brice Duval (1790-1832) was the son of a U.S. Supreme Court Justice. Following his service in the U.S. Army as a captain of the 42nd Infantry Regiment (1815-1818), he returned to Baltimore and married Mrs. Duval. The couple settled in their own home on the property of Marietta Plantation near Glenn Dale, Prince George's County, Maryland. Their life was marked with tragedy from the beginning of their marriage. From 1818-1825, Mrs. Duval bore six children and lost five of them. Despite the many losses, the couple did eventually have four children that lived into adulthood. Beginning in 1828, Mr. Duval had an affliction that deeply effected his mind, putting him in a Philadelphia sanitarium by 1831, where he ultimately died. Mrs. Duval soon took ill after her husband's death, and the birth of their last child, and passed in 1832. She is buried on the Marietta Plantation grounds with other Duval family members.