Frederick William Victor Albert of Hohenzollern, also known as Kaiser Wilhelm was the leader of Germany during WWI
Kaiser Wilhelm
The Kaiser you seek is Wilhelm.
Frederick William Victor Albert of Prussia
Kaiser Wilhelm II
Kaiser Wilhelm II
No Germany was defeated & the Kaiser went into exile in the Netherlands.
Germany which was ruled by Kaiser Wilhelm I.
Kaiser Wilhelm II
Kaiser Wilhelm emperor of Germany since 1888
Wilhelm II was the Kaiser ("Emperor") of Germany before World War I started; he continued to rule until Germany collapsed at the end of the war.
The leader of Germany in WW1 was not a king, his title was Kaiser, specifically, Kaiser Wilhelm II