Built by William the Conqueror, the Tower of London is guarded by a group of what species of bird, due to superstition?

The Tower of London plays host to at least six ravens due to a superstition. According to legend, King Charles II, known to be a superstitious person, was told never to remove the ravens from the Tower or his kingdom would crumble. Ever since, ravens have been kept there, even requiring a Ravenmaster to care for them.

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