The Pisa class consisted of three armored cruisers built in Italy in the first decade of the 20th century. Two of these were for the Royal Italian Navy and the third was sold to the Royal Hellenic Navy and named Georgios Averof. This ship served as the Greek flagship for the bulk of her active career and participated in the Balkan Wars of 1912–1913, fighting in two battles against the Ottoman Navy. She played a minor role in World War II after escaping from Greece during the German invasion in early 1941. Influenced by communist agitators, her crew mutinied in 1944, but it was suppressed without any bloodshed. Georgios Averof returned to Greece after the German evacuation in late 1944 and became a museum ship in 1952. She is the only surviving armored cruiser in the world.

Georgios Averof is a modified Pisa-class armored cruiser built in Italy for the Royal Hellenic Navy in the first decade of the 20th century. The ship served as the Greek flagship during most of the first half of the century. Although popularly known as a battleship (θωρηκτό) in Greek, she is in fact an armored cruiser, the only ship of this type still in existence.