Aries is considered the first sign in the entire zodiac. It is a cardinal sign that is masculine. As a fire sign, the Aries zodiac sign is ruled by the planet Mars and it is associated with the first house of astrology, which is the house of self. People born under the zodiac signs of Aries are thought leaders and pioneers. Although an Aries individual is the first in line to get things going, he prefers to initiate things rather than complete them. And Aries individuals are very competitive in their nature.