High Quality Content by WIKIPEDIA articles! Helen Percy, Duchess of Northumberland, GCVO (13 December 1886 13 June 1965) was born as Helen Magdalan Gordon-Lennox, the daughter of the Earl of March and Kinrara (later Duke of Richmond). She was married on 18 October 1911 to Earl Percy, who succeeded his father as 8th Duke of Northumberland in 1918, whereupon she became known as the Duchess of Northumberland. They had six children.