Britain is the home plane of the Knights of the Round Table, Merlin, Morgan Le Faye, the Holy Grail and Sir Mordred. Merlin was imprisoned in a crystal in that realm by Morgan Le Faye. Rather than a true "realm" as such, it is an island (more properly known as Great Britain) on Earth - and where Jagex is based. The Holy Grail is not a British relic, but King Arthur - in legend - is often associated with searching for it, although the player eventually finds it in the Fisher Realm.
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