kaiserdoms

/ˈkaɪzərˌdɑmz/
noun
  1. Plural of kaiserdom; multiple territories or empires ruled by kaisers, or multiple periods of kaiser rule.
    • The history book compared the different kaiserdoms of Europe in the 19th century.
    • Several kaiserdoms rose and fell over the centuries in central Europe.
    • The museum exhibit displayed artifacts from various kaiserdoms across the continent.