Henry George Alan Percy, 9th Duke of Northumberland (15 July 1912 – 21 May 1940) was the son of Alan Percy, 8th Duke of Northumberland and Lady Helen Gordon-Lennox.

[1] He served as Parliamentary Private Secretary to the Lord Privy Seal in 1935.

He was killed at Pecq in Belgium, serving with the 3rd Battalion Grenadier Guards during the retreat to Dunkirk.

A posthumous portrait by Oswald Birley is now displayed at the family seat of Alnwick Castle.

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