A national landmark, the Riversdale House was built in 1801 by a Flemish aristocrat, Henri Joseph Stier, who had fled from Europe...
patch.com
Riversdale House was built by Belgian aristocrat Henri Stier.
washingtonpost.com
restored plantation home
pgparks.com
Site of the gates at the original entrance to Riversdale, or the Calvert Mansion. Built 1800 1803 by Baron Henri Joseph Stier of Belgium, as a wedding gift for his daughter Rosalie Eugenie who married George Calvert, June 11, 1799.
hmdb.org