The Jedi Order was an ancient monastic peacekeeping organization unified by its belief and observance of the Force, specifically the light side. The Jedi were the guardians of peace and justice in the Galactic Republic, and became the most famous of the various groups that relied on the Force for their power. Led by a series of Jedi Councils, the Order grew over the millennia despite facing many trials, most often threats from the Sith, wielders of the dark side of the Force.