A ruler or person in control — someone who governs or dominates a group, region, or organization.
かつてこの国は強力な支配者によって統治されていた。
This country was once ruled by a powerful ruler.
会社の実権を握る支配者の影響力は大きい。
The influence of the person who holds the real power in the company is great.
物語は圧政的な支配者とそれに抵抗する人々の戦いを描いている。
The story depicts the struggle between an oppressive ruler and those who resist him.