Ladies Whose Bright Eyes is a novel by Ford Madox Ford. It was written in
1911 and extensively revised in 1935 and published under Ford's common
pseudonym Daniel Chaucer.
Although it has a time travel theme of a sort, is usually classed as
mainstream literature rather than science fiction. As its author explicitly
stated, "(...)The idea of this book was suggested to me by Mark Twain's "A
Connecticut Yankee in King Arthur's Court". It occurred to me to wonder what
would really happen to a modern man thrown back to the Middle Ages…".