twin-gun turrets, one each fore and aft. Each turret had a firing arc of 260°. All four 50-calibre Pattern 1905 guns were mounted in the corners of the superstructure in armoured casemates. These guns had a firing arc of 120° and could fire straight ahead or astern. The dozen Canet Pattern 1892 45-calibre guns were mounted in the lower casemates. The anti-torpedo boat armament consisted of 14 Canet Pattern 1892 50-calibre guns mounted in sponsons on the upper deck, protected by gun shields. She carried two torpedo tubes on the broadside aft. Wartime modifications Ioann Zlatoust was fitted with anti-aircraft guns on top of each of her turrets during 1915 and screens were added on top of her funnels to keep out light bombs. She was initially received four 75-millimetre guns, but this was later altered to a pair of 75 mm guns and another pair of guns. Service history Construction of Ioann Zlatoust began on 14 November 1903, well before the formal keel-laying ceremony on 13 November 1904. Progress was relatively quick, despite the disruptions caused by the 1905 Revolution, and she was launched on 13 May 1906. Fitting-out, however, was considerably delayed by a number of changes made as the navy digested the lessons of the Russo-Japanese War. For example, there was a period of seven months in 1907 where virtually no work was done on the ship and she was not completed until 1 April 1911. Ioann Zlatousts turrets had originally been intended for a reconstruction of the elderly pre-dreadnought , but they were diverted to Ioann Zlatoust after that reconstruction was cancelled. Before the beginning of World War I the Black Sea Fleet experimented with concentrating fire from several ships under the control of a "master ship". They had to be identically armed and were equipped with additional radio gear to transmit and receive range and deflection data. Ioann Zlatoust became the master ship for the Black Sea Fleet, working with Evstafi and . Two weeks after the Russian declaration of war on the Ottoman Empire on 2 November 1914, the Black Sea Fleet, comprising the pre-dreadnoughts Evstafi, Ioann Zlatoust, Pantelimon, , , and three cruisers were escorted by three destroyers and 11 torpedo boats set out on 15 November to bombard Trebizond. They did this successfully on the morning of 17 November and they turned west to hunt for Turkish shipping along the Anatolian coast