SMS König Wilhelm  was an armored frigate of the Prussian and later the German Imperial Navy. The ship was laid down in 1865 at the Thames Ironworks shipyard in London, originally under the name Fatih for the Ottoman Empire. She was purchased by Prussia in February 1867, launched in April 1868, and commissioned into the Prussian Navy in February 1869. The ship was the fifth ironclad ordered by the Prussian Navy, after Arminius, Prinz Adalbert, Friedrich Carl, and Kronprinz. She was built as an armored frigate, armed with a main battery of sixteen 24 cm (9.4 in) and five 21 cm (8.3 in) guns; several smaller guns and torpedo tubes were added later in her career.

The Thames Ironworks and Shipbuilding Company, Limited was a shipyard and iron works straddling the mouth of Bow Creek at its confluence with the River Thames, at Leamouth Wharf on the west side and at Canning Town on the east side. Its main activity was shipbuilding, but it also diversified into civil engineering, marine engines, cranes, electrical engineering and motor cars.