Regnant
Part of speech: adjective
Definition: reigning; currently holding power in government dominant; holding more power or influence than others
Ruling
Part of speech: adjective
Definition: That rules or rule.
Part of speech: noun
Definition: An order or a decision on a point of law from someone in authority.
Part of speech: verb
Definition: To regulate, be in charge of, make decisions for, reign over.
Example sentence: It is our happiness to live under the government of a PRINCE who is satisfied with ruling according to law; as every other good prince will - We enjoy under his administration all the liberty that is proper and expedient for us.