Start with high-confidence medieval historical fiction books, then narrow by subgenre or adjacent topics.
The Crystal Cave
Unknown author
Hadrian's Wall
William Dietrich
Wolves of Winter
Dan Jones
Viking Warrior
Connie Mason
In a Dark Wood Wandering
Hella S. Haasse, Katherine Kellgren
The Mark of the Horse Lord
Rosemary Sutcliff, Scott O'Dell
