11. The monarch is not permitted to occupy a throne located abroad.

Justification: Out of reverence for the British monarchy
There is no exception, not even for fictional thrones.
This is not a law; rather, it is a long-standing, ancient tradition (though one could argue that the two have equal degrees of force). It is customary for British monarchs to occupy only British thrones; they are not permitted to occupy foreign ones.

It is not permitted for the monarch to reside on a foreign throne. ©Getty Images/PPool
According to many media outlets, including Stack Exchange, this law is considered an “age-old mark of respect.” This was a very important regulation for Queen Elizabeth. She even graciously declined to sit on the Iron Throne when she was invited to the Game of Thrones set, despite being in awe of its magnificence.