HMTSMonarch(1883), built in 1883 for the Post Office. Sunk 1915 off Folkestone in World War I.
HMTSMonarch(1916), built in 1916 as a replacement for CSAlert but named Monarch after the 1915 sinking. Badly damaged by friendly fire from an American ship during the Normandy landings (Monarch was tasked with providing a telephone connection to France). Sunk by U-boat off Folkestone 16 April 1945 after repairing a cable to the Netherlands.
HMTSMonarch(1945), launched in 1945 and completed in 1946 she was renamed HMTS Sentinel in 1970 and broken up in 1977.
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