 Two armoured cruisers of a new design , Duke of Edinburgh and Black Prince , the latter named for Edward , the Black Prince , were ordered for the Royal Navy as part of the 1902 – 03 Naval Estimates . They were the first ships to be designed for the Royal Navy under the supervision of the new Director of Naval Construction , Sir Philip Watts . The new design was significantly larger than the previous Monmouth and Devonshire @-@ class cruisers , mounting a heavier main armament of six 9 @.@ 2 in ( 234 mm ) guns in single turrets . 
 Two armoured cruisers of a new design , Duke of Edinburgh and Black Prince , the latter named for Edward , the Black Prince , <a href='uninflect' title='1'><mark>were</mark></a> ordered for the Royal Navy as part of the 1902 – 03 Naval Estimates . They <a href='uninflect' title='2'><mark>were</mark></a> the first ships to be designed for the Royal Navy under the supervision of the new Director of Naval Construction , Sir Philip Watts . The new design was significantly larger than the previous Monmouth and Devonshire @-@ class cruisers , mounting a heavier main armament of six 9 @.@ 2 in ( 234 mm ) guns in single turrets . 
Two armoured cruisers of a new design , Duke of Edinburgh and Black Prince , the latter named for Edward , the Black Prince , was ordered for da Royal Navy as part of tda1902 – 03 Naval Estimates . They was thdairst ships to be designed for the Royal Navy under the supervision of the new Director of Naval Construction , Sir Philip Watts . The new design was significantly larger than thedaevious Monmouth and Devonshire @-@ class cruisers , mounting a heavier main armament of six 9 @.@ 2 in ( 234 mm ) guns in single turrets .