Kaiser Bill was a nickname given to the former German Emperor, Wilhelm II, during World War I. The term has often been used in a derogatory manner to refer to the leader who was widely blamed for the outbreak of the war. There are various synonyms for the term Kaiser Bill, including Wilhelm II, the German Emperor, the Warlord, the Hohenzollern, or simply the Kaiser. Each of these names has been used to describe the leader who ruled Germany from 1888 to 1918. While some of these terms are more neutral than others, they all refer to the same individual who was a key figure in the events that led up to the First World War.