Realm
(重定向自Realms)
A realm is a community or territory over which a sovereign rules; it is commonly used to describe a kingdom or other monarchical or dynastic state.
The Old French word reaume, modern French royaume, was the word first adopted in English; the fixed modern spelling does not appear until the beginning of the 17th century. The word supposedly derives from medieval Latin regalimen, from regalis, of or belonging to a rex, (king). The word rex itself is derived from the Latin verb regere, which means "to rule". Thus the literally meaning of the word realm is the territory of a ruler, traditionally a monarch (emperor, king, grand duke, prince, etc.).