First Emperor of Chaturn

Known only as the Emperor, they ruled the Empire of Chaturn until their death.

Death Star disaster on Mercury
After the destruction of the Sun, Doom Guy proposed to Chaturn that they must build a "gigantic new Space vessel", called the Death Star. The Emperor agreed to this, along with Dr. Halsey. The top Chaturn scientists began constructing the Death Star, however they failed to take into account the size of the planet Mercury - the Death Star was too large and could not fit inside its own gravity well.

As a result, the Death Star exploded, killing everyone on Mercury, presumably including the Emperor.

Legacy
After everyone on Mercury was killed, a new Chaturn Empire had to be founded by a new Chaturn emperor. The new Chaturn Empire seamlessly replaced the old one, and continued its mission as if nothing happened.