The Antarans evolved on the planet Antara. In the 15th century, they had developed a spacefaring civilization which began an aggressive expansion outward. In the 19th century, tensions rose between the Antarans and the Denobulans, due to the former's militant colonization of the later's home star system. In 1830 CE, the two species fought a destructive war which left millions dead on both sides. As a result, the Antarans and Denobulans often held grudges against each other, even centuries later.