The sovereign of Heaven oversees Heaven and all of its inhabitants. He is also responsible for maintaining order in the universe, often assigning tasks to angels. The ruler of Heaven is often regarded as the ultimate sovereign of all reams.
However, when God took interest in creating and evolving humanity, his relationship with Goddess deteriorated. After Lucifer was cast out of Heaven, God somehow succeeded in defeating his wife and imprisoning her in Hell. Thus, leaving God the sole ruler of Heaven.