Ammiraglio di Saint Bon was a pre-dreadnought battleship of the Italian Regia Marina (Royal Navy) built during the 1890s.

The ship was obsolescent by World War I and was slated to be broken up in 1914–1915, but the need for warships granted Ammiraglio di Saint Bon a respite.

Steam for the engines was provided by twelve coal-fired cylindrical fire-tube boilers, which were vented through a pair of funnels on either end of the mast.

[1] The ship spent the first several years of her career in the 1st Squadron, along with her sister Emanuele Filiberto, the three Re Umberto-class ironclads, and the two Regina Margherita-class battleships.

On 19 April, Ammiraglio di Saint Bon and most of the fleet returned to Italy, leaving only Pisa, Amalfi, and a flotilla of torpedo boats to cruise off the Ottoman coast.

[11] On 30 April 1912, Ammiraglio di Saint Bon and the rest of the 3rd Division escorted a convoy of troopships from Tobruk to the island of Rhodes.

In July, Ammiraglio di Saint Bon and the rest of the division had withdrawn to Italy to replace worn-out gun barrels, along with other repairs.

[13] In 1913, Ammiraglio di Saint Bon participated in an international naval demonstration in the Ionian Sea to protest the Balkan Wars.

The goal of the blockade was to prevent Serbian reinforcements from supporting the siege at Scutari, where Montenegro had besieged a combined force of Albanians and Ottomans.

Pressured by the international blockade, Serbia withdrew its army from Scutari, which was subsequently occupied by a joint Allied ground force.

[15] Nevertheless, the outbreak of war prompted Italy to retain Ammiraglio di Saint Bon and her sister, which had been scheduled for disposal in 1914–1915.

The Italian Naval Chief of Staff, Admiral Paolo Thaon di Revel, believed that an active fleet policy was prohibited by the serious threat from submarines in the confined waters of the Adriatic Sea.

Instead, Revel decided to implement blockade at the southern end of the Adriatic with the battle fleet, while smaller vessels, such as the MAS boats, conducted raids on Austro-Hungarian ships and installations.

[16] From the onset of Italian participation in the war, Ammiraglio di Saint Bon was used as a harbor defense ship in Venice, along with her sister and the old ironclad Sardegna, as well as two cruisers and several smaller craft.

[13] The ship remained in the Italian Navy's inventory for only a short time after the end of the war; she was stricken from the naval register on 18 June 1920 and subsequently broken up for scrap.