While the present Oxon Hill Manor was built circa 1928, the land and former mansion was home to the nephews of George Washington, and the nephew of John Hanson, the first president elected by the Continental Congress under the Articles of Confederation. Hanson visited Oxon Hill Manor often and died there in 1783. He is believed to be buried on the estate's cemetery. The original mansion was destroyed by fire in 1895.
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In 1952 Fred Maloof acquired the estate and established a museum for fine art and John Hanson memorabilia.