Admiralissimo is an informal title for a chief naval officer, and is a naval equivalent of generalissimo.
List of senior naval officers referred to as admiralissimo Hayreddin Barbarossa – 15th/16th-century Turkish admiral Albrecht von Wallenstein – admiral of the Baltic Sea John Jellicoe, 1st Earl Jellicoe – British admiral of the fleet Lord Charles Beresford – British 19th/20th-century admiral Augustin Boué de Lapeyrère – Commander-in-Chief of France's Mediterranean forces George Dewey – American Admiral of the NavyCHAP 378, "An act creating the office of Admiral of the Navy", United States Congress Deodoro da Fonseca – Brazilian 19th-century admiral
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