Emil Leeb

Emil Leeb was a BavarianGerman general who saw active service during both World Wars. His older brother, who became Field Marshal Wilhelm Ritter von Leeb, had the knightly rank of Ritter and the nobiliary particle of von, not by birth, but thanks to the conferment of the Bavarian Military Order of Max Joseph and a patent of nobility. Hence, the older brother had von between his names, but the younger brother did not.

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Source: Wikipedia