Reign (verb)

1. Be king or queen.
2. Have the power to rule or control.

Origin:

Middle english: from old french reigner, from latin regnare, from rex, reg- "king".

Examples:

1. He reigned over the kingdom for 50 years.
2. She reigned as queen for 20 years.
3. The dictator reigned over the country with an iron fist.
4. He reigned over the company as CEO for a decade.
5. The disease reigned over the population before the vaccine was developed.