The Lord of the Rings franchise was placed in the expert hands of Peter Jackson, who stuck as close as possible to the original writings of J.R.R Tolkien as cinema would allow. To bring the magic to life, it was necessary to invest in beautiful sets, realistic costumes, and, of course, actors that could keep Tolkien's visions alive.
Source:https://www.cbr.com/lotr-cast-other-movies-x-men/