Fisher, Admiral of the Fleet Lord Fisher (1841-1920), earlier John ("Jackie") Fisher

Most senior British Admiral (First Sea Lord) during First World War, until resignation over the Dardanelles campaign in May 1915.

Entered Royal Navy in 1854, rising to become a Rear-Admiral in 1890. Held a succession of senior positions before becoming First Sea Lord (1904-1910). Retired, but brought back as First Sea Lord by Winston Churchill in 1914. Quarrelled with Churchill over the Dardanelles operation and resigned in May 1915.