There is no reference from the time of King Baldwin IV wearing a mask. This detail was invented in the script of the 2005 movi…
Kingdom of Heaven Inspired King Baldwin IV the - Norway
Full article: The King's Horseman: Portraits of Authority in Southwestern Nigeria
Did King Baldwin IV ever wear a mask? - Quora
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Suspense films of the 1940s - The Timeless Theater
Baldwin IV of Jerusalem Quotes Essential T-Shirt for Sale by Faithbranding
Patrick Baldwin, Jr. on peanut butter & jelly sandwiches: “I never liked the texture”
The Leper's design appears to be based on Baldwin IV of Jerusalem from the movie Kingdom of Heaven. : r/darkestdungeon