Britain’s King George V loathed his cousin Kaiser Wilhelm II, Germany’s supreme ruler; and Wilhelm, in turn, envied Britain’s expansive collection of colonies and its command of the seas, so much so that in 1900 Germany began a campaign to build warships in enough quantity and of large enough scale to take on the British navy. This in turn drove Britain to begin an extensive modernization of its own navy, for which it created a new class of warship, the Dreadnought, which carried guns of a size and power never before deployed at sea.