Mathew H. Ritchey House, also known as Mansion House and Belle Starr House, is a historic home located in Newtonia, Newton County, Missouri. It was built about 1840, and is a two-story, brick dwelling with a two-story rear wing built using slave labor. The house rests on a sandstone block foundation and has a side-gabled roof. It features a one-story front portico and interior end chimneys. Also on the property is the contributing Ritchey family cemetery, outbuildings, and a well. During the American Civil War, the site saw fighting during both the First and Second Battles of Newtonia, which required its use as a hospital after the battles. It was listed on the National Register of Historic Places in 1978 and is a contributing property in the First Battle of Newtonia Historic District. The