"This is a series of illustrations that imitates the style of old medieval paintings and adds a macabre flavour by incorporating some of H.P. Lovecraft's famous monsters. The text is mostly medieval Middle High German."
- Robert Altbauer, Fantasy Cartographer
You can see the full set of Robert Altbauer's "The Crusades And Lovecraft's Monsters" over on his ArtStation page.
Massive thank you also to Al Bruno III for first drawing this to my attention.