The Hydran Kingdom is the official name of the Hydran government, an interstellar nation located within the space of the galaxy's Alpha or Beta Quadrants. The people are led by the Monarch of the Hydran Kingdom, who has many children. However, clear lines of succession are somewhat difficult as the Hydran people are not monogamous. The Hydran Royal Family alone consists of 30,000 beings, with 1,200 of them being Princes or Princesses.
The religion of the Kingdom consists of worship of a pantheon of minor gods, as well as space living beasts.
The Hydran Kingdom was once conquered by a united Klingon and Lyran invasion force that ruled over them for many years from orbital stations. (As the Hydrans are methane breathers, the invaders could not comfortably survive on the surface.) During this time, the Hydran Lost Colonies served as the only 'free' group of Hydrans. Eventually, the Kingdom was freed thanks to the aid of the Federation. (ST video games: Starfleet Command, Star Fleet Battles)