A person who reigns is a monarch. They can be a king, a queen, an emperor, a crown prince or hold some other title.
"DICTATOR".
Dictator
"The Driver" The person(s) at the reins is called a *Coachman*(-men)
monarcy
Ozy Reigns is 6'.
It is not clear what you mean by Roman reigns or what it is meant to be.
Anarchy Reigns happened in 360.
Elizabeth Reigns was created in 2003.
Four Reigns was created in 1953.
London Reigns is 5' 6".
Morgan Reigns is 170 cm.
This type of government is called a monarchy