It's not where it originated but it's where the language and specific style of it in european monarchies came from.

This is actually where I believe we got the hierarchy for emperors and kings. As in an emperor of a region being above the local kings of the region. For example, Germany after unification was ruled by an Emperor (Kaiser) and he ruled over regional kings like the king of bavaria or Saxony. I am trying to think of a better example but the only other I can think of is the HRE.