A medieval comic book
This a page from the Bible of Stephen Harding, a manuscript produced in the early 12th century (Dijon, Bibliothèque municipale, MS 14). These scenes, which recount the life of biblical King David, read like a contemporary comic book: from top to bottom and left to right, with captions on top of each image (and sometimes within the images). It is one of the earliest, and most striking, examples of comic-like medieval pages.
You can browse the whole manuscript here