Capellan

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The Capellans (Cereans) were a colony of Humans living on the planet Capella IV. They were a warrior tribe race led by the Teer. (TOS novelization: Friday's Child)

The Federation first made contact with the Capellans in the late 2250s, and because of the planet's position near the Klingon Empire, Starfleet decided to keep an eye on the Capellans and protect them.

In 2264, Dr. Leonard McCoy led a medical relief mission on behalf of Starfleet Medical to teach the Capellans to embrace medical technology and look after themselves, but after six months, little success was made because of Capellan pride and mistrust in technology.

In 2267, the Klingons had gained the trust of a tribe leader named Maab, and persuaded him to kill Akaar, the teer, and take his position as leader. However, thanks to Captain James T. Kirk, Commander Spock and McCoy of the USS Enterprise, Akaar's widow, Eleen, and unborn son, later named, Leonard James Akaar after his rescuers, are taken to safety.

The Enterprise crew manage to thwart the Klingons efforts, which led to a pitch ground battle with the Klingons, which the Capellans help defend their land.

(TOS novels: My Brother's Keeper, Book 3: Enterprise and Invasion!, Book 1: First Strike; also TOS novelization: "Friday's Child", Star Trek 3)