Armgaard Karl Graves (born 7 May 1882 in Berlin, probably died in the US) acted as a mole for MI5, the British counterintelligence service, inside the intelligence-wing of the Imperial German Navy, both before and during the First World War.

[1] During the Agadir crisis, Graves was probably recruited directly from the prison for the Nachrichten-Abteilung at its Berlin headquarters in the presence of Arthur Tapken, Georg Stammer, and Gustav Steinhauer.

[1] As' W. Lewis, he was to observe movements of Royal Navy warships off Scotland, especially in front of the naval bases Rosyth and Cromarty, for which he received £15 (£1,930 in 2025) a month.

In November 1916, he tried to extort $3,000 ($90,400 in 2025) by blackmailing the wife of Johann Heinrich von Bernstorff, the Imperial German Ambassador to the United States and Mexico, using letters "alleged to contain matters showing her infirmities and failings.

[citation needed] Graves was arrested in 1917 for being in a restricted zone for foreigners in Kansas City and interned as an enemy alien until the end of the war in November 1918.

[citation needed] Renowned British war poet Robert von Ranke Graves was initially received with intense suspicion when a rumour was started that he was a spy.