Aries Aries is the first sign of the twelve zodiacs and is one of the only six zodiac signs that are ‘positive’. The Aries sign is ruled by the planet of Mars, it is also ruled by the first house. If born between the 21st of March and the 19th of April, you are an Aries. Aries is a fire sign, which explains why Arians (Ariens) are stubborn, determined and a driving force.