Kaiser

noun3

1. •
   An emperor of a German-speaking country, particularly the Holy Roman Empire (962–1806), the Austrian Empire/Austria-Hungary (1806–1918), or the German Empire (1871–1918) — often specifically Wilhelm II.
2. •
   Any emperor or autocrat, or one who attempts to be one.

   • And Black Ivo is a veritable Kaiser. — 1915
3. •
   A Kaiser roll: a round, pinwheel-shaped roll.