What’s the ruling planet of Scorpio?

Pluto
Mars
Scorpio/Ruling planet

Is Scorpio still ruled by Mars?

Before Pluto's discovery in 1930, and its subsequent integration into astrology, Scorpio's ruling planet was traditionally ambitious and competitive Mars. Traditional astrologers consider this to be the sign's true planetary ruler, and most modern astrologers still acknowledge Mars as one of Scorpio's co-rulers, too.