Wilhelm II, also known as Willy to his royal relatives, was the Kaiser of Germany during World War I.
By December 1900, he was already known internationally as an ambitious figure. In the United Kingdom, people were already discussing the prospect of his ambitions causing a European land war. (PROSE: Foreign Devils)
In 1902, King Edward VII, the Kaiser's cousin, believed that "Willy" would have jumped at Professor Challoner's offer to rule the world. (PROSE: Revenge of the Judoon)
In 1903, after receiving a wealth of information from the future, Grigori Rasputin foresaw the Kaiser's role in the First World War. (AUDIO: The Wanderer)
It was during the Kaiser's reign that the Institute of Alien Technology was founded. (AUDIO: The Dying Room)
After the Eighth Doctor told Molly O'Sullivan about the Daleks' aggressive nature, she compared them to the Kaiser. (AUDIO: Fugitives)