Marius Hollseher
From Warhammer - The Old World - Lexicanum
Marius Hollseher was the Elector Count of Stirland. [1a]
History
Whilst crusading in Araby he discovered the Mirror of Nightmares and inadvertently travelled via it into the Realm of Chaos itself. He was later allowed by the dark gods of Chaos to return to the mortal world and there he wrote an account of his journey, the Liber Malefic. [1a]
He was burned at the stake and Witch Hunters still hunt down copies of his book, as do cultists and witches. [1a]
Sources