Located south of Laurel in Prince George's County, Maryland, United States, Montpelier Mansion is a five-part, Georgian style plantation house most likely constructed between 1781 and 1785. It has also been known as the Snowden-Long House, New Birmingham, or simply Montpelier. Built by Major Thomas Snowden and his wife Anne, the house is now a National Historic Landmark operated as a house museum. The home and remain of what was once a slave plantation of about . It was declared a National Historic Landmark in 1970, primarily for its architecture. History Richard Snowden originally migrated to America in 1658 from Birmingham, England, where his family had settled for many years after originating in Wales. Richard the immigrant had a son, Richard (1719–1753), who had a son, Richard the "iron master" (d. 1763). Richard the iron master acquired much wealth through an iron forge, mining local iron. Richard then had a son, Thomas (1722–1770), who had a son Major Thomas (1751–1803), so called because of his service in the American Revolution. Major Thomas married Anne Ridgely, who was raised at an earlier estate named Montpelier in Fulton, Maryland, and built the Mansion circa 1783. Their son Nicholas Snowden, who had been born at the mansion in 1786, was its next owner, until he died in 1831. (His son Nicholas N. Snowden, also born at the mansion, became a farmer next to Avondale Mill, and died at Manassas while serving in the 1st Maryland Infantry, CSA.) The home then passed to Nicholas' daughter Julianna Maria who married Dr. Theodore Jenkins there in 1835. Dr. Jenkins died in 1866 and upon Mrs. Jenkins' later death, the mansion passed to her children who kept ownership in the family until 1890. The home was later owned by speculative investors W.P. Davis and Martin W. Chollar. In 1895, it was sold to Josephine D. Taylor of New York as a summer home. Its title went to Lewis H. Blakeman of New York in 1900, then to New York writer Edmund H. Pendleton who lived there from 1905 until his death in 1910, having made it his winter home. Pendleton's estate sold the mansion to Otto V. von Schrader in 1911. After a succession of other owners, mansion ownership transferred in 1928 to Breckinridge Long, Undersecretary of State under Franklin D. Roosevelt and United States Ambassador to Italy from 1933 to 1936. Long's daughter Christine L. Willcox,