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Interestingly though, little of note is actually known about the Witch-king himself.
Source: https://screenrant.com/lord-of-the-rings-witch-king-reveals/
The Witch-king plays a major role in the films, wounding Frodo at Weathertop in Fellowship of the Ring and leading the assault against Gondor in The Return of the King -- ultimately setting up his final fate, falling during a battle to Éowyn.
Source: https://www.cbr.com/tom-bombadil-witch-king-lord-of-the-rings-theory/