Looking for Title / Author

I am looking for a book I read some years ago, set in medieval Europe, probably France. The only other clue I can give is that the same author wrote another book set in the 17th century, I think in England during Cromwell's time.

The Divine Campaigns by Time-Life Books? Seriously, you need to give more information, starting from if we are talking about fact or fiction here.

Sorry, the book I am looking for, set in medieval Europe, is a novel.

So is the one set in the 17th century, though some tendril of memory tells me it was set on the continent, not in England. Maybe during the thirty-years war?

I was hoping the author was so well-known to the people in this group that they would know who it was just from the vague clues I have.

The only other thing I think I recall, is that the style of the writing of the novel set in medieval Europe was a little difficult, but that some of the images he or she conjured up were excellent, almost dreamlike - giving a feeling of being in a kind of medieval never-never land.

Hmm. Couple of well-known writers who fit the criteria (both can be a bit difficult and dream-like too).
The Name of the Rose and Baudolino since Umberto Eco has written also The Island of the Day Before set in 17th century...

Or The Nonexistent Knight by Italo Calvino who also has written The Baron in the Trees and The Cloven Viscount...

I wonder if the folks in the LT Historical Fiction group might be of help?
http://www.librarything.com/groups/historicalfiction

Timeline by Michael Crichton? That one is a real long shot!

Your description of the style does remind me a bit of H. F. M. Prescott's The Man on a Donkey: A Chronicle, which was set in Reformation England, I believe.

Maybe try the Name that Book group. http://www.librarything.com/groups/namethatbook

Can you recall ANYTHING specific that happened in either book?

My wild guess might be:
James Branch Cabell -- Gallantry, or Chivalry, or The Line of Love?

Thanks for the replies. Nothing mentioned checked out as what I (vaguely) remember. Glad to find this list in any case - it's a great resource.

Hilary Mantel? Denise Giardina, (Fallam's Secret)? Virginia Woolfe (Orlando)?