So I found out that Rulers Mask quite references to Baldwin IV

The Leper King and his Heirs: Baldwin IV and the Crusader Kingdom of Jerusalem: 9780521017473: Hamilton, Bernard: Books

The Leper's design appears to be based on Baldwin IV of Jerusalem from the movie Kingdom of Heaven. : r/darkestdungeon

Baldwin IV of Jerusalem Quotes Essential T-Shirt for Sale by Faithbranding

Full article: The King's Horseman: Portraits of Authority in Southwestern Nigeria

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…

Watch The Great War, American Experience, Official Site

I've always wanted this, i present to you King Baudouin IV - The Leper King. : r/CrusaderKings

So I found out that Rulers Mask quite references to Baldwin IV that wears Silver Mask. And the item's description makes it obviously : r/Eldenring

Did King Baldwin IV ever wear a mask? - Quora

Did King Baldwin IV ever wear a mask? - Quora

Did King Baldwin IV ever wear a mask? - Quora

King Baldwin IV, Heroes Wiki

How Baldwin IV Went From A Leper To The King Of Jerusalem

Did King Baldwin IV ever wear a mask? - Quora