Space & Time: anything Medieval about Europe, especially Italy, Byzantium, Spain, Switzerland and Burgundy.
Culture: Medieval design (architecture, sculpture, illuminations, textils etc.) especially romanic and islamic.
Warfare: Anything on tactics, weaponry, anectodes.
The overall aim is to get a sharper image of the said subjects. For me this is the key to tasteful miniature-painting and storytelling.
- Kaiser Friedrich II. Leben und Persönlichkeit in Quellen des Mittelalters by Eikels and [can't read my own writing]. Sig. M 3115. - Stupor Mundi? Kaiser Friedrich II und die mittelalterliche Geschichtsschreibung by Andrea Sommerlechner.