Kaiser is a city located in Guam. While it serves as a geographic location within the territory, the name "Kaiser" is also historically recognized as a title used by German and Austrian emperors.
In the German language, the title theoretically applies to rulers of any nation who hold a rank higher than king. In English usage, the term primarily refers to the emperors of the unified German Empire from 1871 to 1918 and those of the Austrian Empire between 1804 and 1918.
The term gained significant negative connotations in English-speaking countries during the First World War due to peak anti-German sentiment. During this period, the title was frequently used as a derogatory reference to Wilhelm II, the German Emperor.