What a treasure trove of goodies already. I think that fiction is a great source of inspiration for Ars, no matter their various faults or flaws, but because they often in a manner not fitting in academic literature can make another time and place come alive and spark the imagination to make some interesting Ars sessions.
Books:
[size=75]foregoing all the books in Danish I'd warmly recommend since few would be able to read them.[/size]
Umberto Eco - I would also recomend him but also agree that it might take some effort and determination.
Ken Follet "The pillars of The Earth": I do not know how they do it, but authors within the spy thriller genre each once in a while write a single but very often succesful historic novel.
Jan Gillou's Crusader Thrilogy about Arn Magnusson has been one of my all time favorites.
Iain Pears "An Instance of the Fingerpost" - rennaisance England at the time of Hobbes and the Lord Protector. Out of period but a great and inspiring read!
Jeanne Kalogridis "The Burning Times"
Brother Cadfile mysteries - have one of them. It is alright.
The Golem - actually exists as a book, I bought it in Prague and is planning a character somewhat based on it. I think the book might be less Hollywood'ized then the old film.
Earthsea - I loved those but really can't remember them. Should reread them.
The endless volumes of medieval romances and folk stories. You can find many books with collections of those.
Films:
Robin the Hooded man - I loved that TV series as a child, but reseeing it have been one of my greatest disappointments (but having great fun doing so).
Lion in Winter - great film (and great music too!)
Last Valley - a bit harrowing but inspiring even if out of period (but awesome music too!)
The Storyteller - a Jim Henson TV series is nice inspiration on the mythical.
Lady Hawke - what a charm. And one of few films that don't disappoint on a review many years later.
Henry V - "O for a muse of fire...." Chorus' intro alone makes it worthwhile.
Kingdom of Heaven extended version (Run away as fast as you can from the cinema version!)
If you don't mind moving toward non-fiction I would especially recomend two books, and they are not heavy reading either:
Danzinger & Gillingham "1215: The Year of The Magna Carta" which gives a comprehensive tour of medieval England. The time apart from your campaign might not matter as much as the fact that England in some significant ways had some differences from continental Europe. But easily digested and inspiring.
Emmanuel Le Roy Ladurie "Montaillou" - even if about a people who in their time where seen as heretics and deviants it is a remarkable detailed insight into daily life and the thoughts of ordinary people. The author is a French historian who focused on history seen from "below" - the ordinary people - rather than from above and what the kings and lords did. This book has a somewhat grim background. The information is based on very detailed reports taken by the inquisition during the time of the Cathar Heresy. One of the reasons that these documents survived may have been because the interogator later moved on to become Pope, and the documents followed him there and was stored at the Vatican.
Still, I found it inspiring in setting a tone for pagan worship an commoners' life on one hand and Church/city politics on the other.