Romulans are a Vulcanoid species that live on a planet named Romulus. Their past goes back to the time that Vulcans had just started to embrace logic, and they were an extremist group that left Vulcan and set course for a different, more habitable planet: Vulcan is a desert planet, with no tides, because it also has no moon. When the departed Vulcans, now Romulans came on to their new planet, they met something called "The Gnawing", a virus that lived in the soil of Romulus. Soon, the sister planet Remus was inhabited too.