Painting of de Ruyter by Ferdinand Bol, c.1667. Original in the collection of the National Maritime Museum, Greenwich.
Monument to Turgut Reis, located in Istanbul. Photo uploaded to Wikimedia by user Alexxx1979.
Walker communicating with one of his ships during an attack on a U-boat, c.February, 1944. Photo in the collection of the Imperial War Museums.
Tirpitz aboard HMS Glasgow, c.1915. Photo in the collection of the Imperial War Museums.
Litograph of Lucas, created c.1837 by Antoine Maurin. Original now in the public domain.
Painting of Tromp by Jan Lievens. Original in the collections of the National Maritime Museum, Greenwich, England.
Statue of Zheng He in Malacca, Malaya. Photo uploaded to Wikipedia by user hassan saeed.
Raeder, c.1940, as Großadmiral of the Kriegsmarine. Photo in the collection of the German Federal Archives.
Engraving of Chabot by André Thévet, c.1584. Original in the public domain.
Engraving of Osterman, c.1740-41, during his tenure as General-Admiral. Original in the public domain.