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Riversdale (Riverdale Park, Maryland)

Riversdale Mansion
Riversdale Mansion, Maryland HABS.jpg
Riversdale Manor in 1989
Riversdale (Riverdale Park, Maryland) is located in Maryland
Riversdale (Riverdale Park, Maryland)
Riversdale (Riverdale Park, Maryland) is located in the US
Riversdale (Riverdale Park, Maryland)
Location 4811 Riverdale Road, Riverdale Park, Maryland
Coordinates 38°57′37″N 76°55′55″W / 38.96028°N 76.93194°W / 38.96028; -76.93194Coordinates: 38°57′37″N 76°55′55″W / 38.96028°N 76.93194°W / 38.96028; -76.93194
Built 1801–1807
Architect de Stier, Baron; Calvert, George
Architectural style Federal, Georgian
NRHP reference # 73002166
Significant dates
Added to NRHP April 11, 1973
Designated NHL December 09, 1997

Riversdale, is a five-part, large-scale late Georgian mansion with superior Federal interior, built between 1801 and 1807. Also known as Baltimore House, Calvert Mansion or Riversdale Mansion, it is located at 4811 Riverdale Road in Riverdale Park, Maryland, and is open to the public as a museum.

Once the manor house and centerpiece of a 739-acre (2.99 km2) slave plantation, Riversdale was built for Belgian émigré Henri Joseph Stier, Baron de Stier, who lived in the Brice House in Annapolis, Maryland immediately prior to building Riversdale. Stier planned the house in 1801 to resemble his Belgian residence, the Chateau du Mick. Four years later, Stier returned to Belgium, leaving the unfinished Riversdale to be completed by his daughter, Rosalie Stier Calvert and her husband, George Calvert, the son of Benedict Swingate Calvert, who was a natural son of Charles Calvert, 5th Baron Baltimore. Rosalie and George Calvert's son, Charles Benedict Calvert, established the Maryland Agricultural College, now the University of Maryland, College Park, on part of the Riversdale property.

While its design has been attributed to William Thornton, this is not supported by available evidence on Thornton's career. The house is architecturally significant as a well-preserved five-part Federal mansion, and historically important for its association with the Calverts, an important Maryland family. It was designated a National Historic Landmark in 1997.


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