Klingons

According to Daniels, the Klingons joined the Federation by the 26th century. The Klingon Empire was founded some time in the 9th century by Kahless the Unforgettable, who performed many heroic feats including the unification of the Klingon people when he killed the tyrant Molor. Kahless came to be revered in Klingon society to the point of near-deification, and many aspects of Klingon culture came to revolve around an emulation of Kahless' life. The Klingons were a humanoid warrior species that originated from the planet Qo'noS (pronounced Kronos), a M-class planet. One of the major powers of the galaxy, the Klingons were a proud race who valued honour and combat. The aggressive Klingon culture had made them an interstellar military power to be respected and feared. Klingons believed that they had the instinctive ability to look an opponent in the eye and see any intent to kill.