The Guylos Empire is a fictional nation from the Zoids universe.
As its name would suggest, the Guylos Empire is ruled by a monarch. Its exact governmental structure is unclear; in the anime there appears to be a senate or ruling council below the Emperor. In the Battle Story, there is even less clear information.
The Guylos Empire is usually depicted as the "antagonist" force in Zoids stories. In the Anime the Empire is initially painted as the "Bad Guy", but the situation became more ambiguous as the story went on. In the Battle Story the story is ambiguous by default.