Sotterley Plantation, St. Mary's County, encompasses almost 300 years of Southern Maryland history. During the 18th century it was a thriving tobacco plantation, owned by the Plater family, and in the 19th century, under the Briscoe family, Sotterley continued as a plantation and busy steamboat landing. In the 19th century the estate contained one of the largest communities of enslaved African Americans in southern Maryland. Today the plantation is maintained as an example of a tidewater plantation on the banks of the Patuxent River. Thanks to descendant Agnes Kane Callum, there is much information available on her enslaved family members, as well as on the plantation's owners. In the 18th century George Plater III, Maryland’s 6th Governor, advertised as runaways Towerhill and Clem. In the 19th century, George Briscoe escaped servitude at Sotterley to join the US Colored Troops.