kaiser

noun

An emperor, especially the German emperor or the ruler of the Holy Roman Empire.

Usage: Often capitalized when referring to a specific historical ruler.; From German, derived from Latin Caesar.

Examples

Kaiser Wilhelm II ruled Germany during World War I.
The kaiser held absolute power over the German Empire.
Many European kaisers were related by blood.
The title of kaiser was used by German and Austrian rulers.
After World War I, the kaiser fled to exile in the Netherlands.