[Cronos]

Nor was it the last kingdom to style itself the Roman Empire. Attempted revivals include the Holy Roman Empire and Napoleon crowning himself as Roman Emperor as late as 1800.

The Dukes of Moscow called themselves Caesar or Tsar and styled Moscow as the Third Rome. The German Kings called themselves Kaiser, Caesar.

[VadeRetro]

The Dukes of Moscow called themselves Caesar or Tsar and styled Moscow as the Third Rome. The German Kings called themselves Kaiser, Caesar.

Good examples as well.