Regnant (adjective)

Exercising power or authority; ruling.

Origin:

Late middle english (in the sense "ruling"): from old french regnant, present participle of regner, from latin regnare, from rex, reg- "king".

Examples:

1. The regnant queen was celebrated for her just rule.
2. The regnant dynasty is a highly regarded one in the history of the kingdom.
3. The regnant king's long rule was characterized by peace and prosperity.
4. The regnant emperor was considered to be the most powerful leader in the land.
5. The regnant monarch is considered to be a symbol of stability and continuity in the nation.