High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! High Quality Content by WIKIPEDIA articles! HMS Caledonia was a broadside ironclad of the Prince Consort class. Originally laid down as two-decker steam ship of the line of the Bulwark class, HMS Caledonia, HMS Triumph (later renamed HMS Prince Consort) and HMS Ocean were converted on the building stocks to armoured frigates. The three ships of the Prince Consort class were intended to improve on HMS Royal Oak, which is often referred to as a half-sister to the rest of the class.