The Devonshire class was a class of six armoured cruisers of the British Royal Navy, launched in 1903–1904 at a cost of around £850,000 each. The ships were designed for commerce protection, and the design was similar to the Monmouth class except that the twin 6 inch (152 mm) turrets and the forward double casemates were replaced by four 7.5 inch (190 mm) single turrets in a diamond arrangement. The 7.5 inch gun was introduced because the all – 6 inch gun armament of the Monmouth class was no longer adequate to deal with the latest likely commerce raiding threats.