Enrico Dandolo was the second of two Duilio-class ironclad turret ships built for the Italian Regia Marina in the 1870s. They were fitted with the largest guns available, 450 mm (18 in) rifled, muzzle-loading guns, and were the largest, fastest and most powerful ships of their day. Enrico Dandolo was built in La Spezia, with her keel laid in January 1873 and her hull launched in July 1878. Construction was finally completed in April 1882 when the ship, named for the 41st Doge of Venice, was commissioned into the Italian fleet.

Castelfidardo was the third of four Regina Maria Pia-class ironclad warships built in French shipyards for the Italian Regia Marina in the 1860s. Castelfidardo was laid down in July 1862, was launched in August 1863, and was completed in May 1864. She and her three sister ships were broadside ironclads, mounting a battery of four 203 mm (8 in) and twenty-two 164 mm (6.5 in) guns on the broadside.