Organians appeared to be humanoids, but instead are a highly advanced noncorporeal life forms. Organia was the Class-M planet located in space claimed by the Klingons and the Federation in the 2260s.
The culture of Organia appeared to be that of Earth of the medieval period. The men and women wore simple garments.
Organians are a peaceful race and refuse to fight. In 2267, this was evident when Klingons killed over 200 Organians.
When a war seemed to be a result of hostilities between the Federation and the Klingons, the Organians heated all weapons and starship controls so they couldn't be touched. This is when it was revealed they were noncorporeal life forms.
The Organians hadn't had physical bodies for millions of years but decided to make it easier for the Federation and Klingon dignitaries. The Organians would impose a truce between the two named the Organian Peace Treaty.