HMS Tetrarch

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Several warships of the British Royal Navy were named HMS Tetrarch after the English word for tetrarchy :

HMS Tetrarch (1917) was a destroyer of the R-Class. The ship was launched in 1917 and sold for scrapping in 1934.
HMS Tetrarch (N77) was a submarine of the T-class . The boat was launched in 1940 and lost in the Mediterranean in 1941.